diff --git a/.travis.yml b/.travis.yml
index eaac2a9..3d51d69 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: go
 go:
-    - 1.9.x
+    - 1.11.x
 script:
   - scripts/devtools.sh
   - make local build
diff --git a/Dockerfile b/Dockerfile
index e7d75a4..63867d4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.9 as builder
+FROM golang:1.11 as builder
 
 WORKDIR /go/src/mikefarah/yq
 
diff --git a/Makefile b/Makefile
index 5d6c2e6..d854d8f 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,6 @@ help:
 	@echo '    make build           Build yq binary.'
 	@echo '    make install         Install yq.'
 	@echo '    make xcompile        Build cross-compiled binaries of yq.'
-	@echo '    make snap            Build a snap package of yq.'
 	@echo '    make vendor          Install dependencies using govendor.'
 	@echo '    make format          Run code formatter.'
 	@echo '    make check           Run static code analysis (lint).'
@@ -65,10 +64,6 @@ xcompile: check
 	@find build -type d -exec chmod 755 {} \; || :
 	@find build -type f -exec chmod 755 {} \; || :
 
-.PHONY: snap
-snap:
-	snapcraft
-
 .PHONY: install
 install: build
 	${DOCKRUN} go install
diff --git a/commands_test.go b/commands_test.go
index f9a71b8..c228a14 100644
--- a/commands_test.go
+++ b/commands_test.go
@@ -7,7 +7,7 @@ import (
 	"strings"
 	"testing"
 
-	"gopkg.in/spf13/cobra.v0"
+	cobra "gopkg.in/spf13/cobra.v0"
 )
 
 func getRootCommand() *cobra.Command {
@@ -122,7 +122,7 @@ func TestReadBadDocumentIndexCmd(t *testing.T) {
 	if result.Error == nil {
 		t.Error("Expected command to fail due to invalid path")
 	}
-	expectedOutput := `Asked to process document index 1 but there are only 1 document(s)`
+	expectedOutput := `asked to process document index 1 but there are only 1 document(s)`
 	assertResult(t, expectedOutput, result.Error.Error())
 }
 
@@ -240,7 +240,7 @@ func TestReadCmd_ArrayYaml_ErrorBadPath(t *testing.T) {
 	if result.Error == nil {
 		t.Error("Expected command to fail due to invalid path")
 	}
-	expectedOutput := `Error reading path in document index 0: Error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
+	expectedOutput := `Error reading path in document index 0: error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
 	assertResult(t, expectedOutput, result.Error.Error())
 }
 
@@ -250,7 +250,7 @@ func TestReadCmd_ArrayYaml_Splat_ErrorBadPath(t *testing.T) {
 	if result.Error == nil {
 		t.Error("Expected command to fail due to invalid path")
 	}
-	expectedOutput := `Error reading path in document index 0: Error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
+	expectedOutput := `Error reading path in document index 0: error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
 	assertResult(t, expectedOutput, result.Error.Error())
 }
 
@@ -307,7 +307,7 @@ func TestReadCmd_ErrorBadPath(t *testing.T) {
 	if result.Error == nil {
 		t.Fatal("Expected command to fail due to invalid path")
 	}
-	expectedOutput := `Error reading path in document index 0: Error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
+	expectedOutput := `Error reading path in document index 0: error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
 	assertResult(t, expectedOutput, result.Error.Error())
 }
 
@@ -457,7 +457,7 @@ func TestPrefixBadDocumentIndexCmd(t *testing.T) {
 	if result.Error == nil {
 		t.Error("Expected command to fail due to invalid path")
 	}
-	expectedOutput := `Asked to process document index 1 but there are only 1 document(s)`
+	expectedOutput := `asked to process document index 1 but there are only 1 document(s)`
 	assertResult(t, expectedOutput, result.Error.Error())
 }
 func TestPrefixMultiAllCmd(t *testing.T) {
@@ -647,7 +647,7 @@ func TestWriteBadDocumentIndexCmd(t *testing.T) {
 	if result.Error == nil {
 		t.Error("Expected command to fail due to invalid path")
 	}
-	expectedOutput := `Asked to process document index 1 but there are only 1 document(s)`
+	expectedOutput := `asked to process document index 1 but there are only 1 document(s)`
 	assertResult(t, expectedOutput, result.Error.Error())
 }
 func TestWriteMultiAllCmd(t *testing.T) {
diff --git a/data_navigator.go b/data_navigator.go
index 589257a..ce3a889 100644
--- a/data_navigator.go
+++ b/data_navigator.go
@@ -19,9 +19,9 @@ func entryInSlice(context yaml.MapSlice, key interface{}) *yaml.MapItem {
 
 func getMapSlice(context interface{}) yaml.MapSlice {
 	var mapSlice yaml.MapSlice
-	switch context.(type) {
+	switch context := context.(type) {
 	case yaml.MapSlice:
-		mapSlice = context.(yaml.MapSlice)
+		mapSlice = context
 	default:
 		mapSlice = make(yaml.MapSlice, 0)
 	}
@@ -29,9 +29,9 @@ func getMapSlice(context interface{}) yaml.MapSlice {
 }
 
 func getArray(context interface{}) (array []interface{}, ok bool) {
-	switch context.(type) {
+	switch context := context.(type) {
 	case []interface{}:
-		array = context.([]interface{})
+		array = context
 		ok = true
 	default:
 		array = make([]interface{}, 0)
@@ -146,18 +146,18 @@ func readMapSplat(context yaml.MapSlice, tail []string) (interface{}, error) {
 }
 
 func recurse(value interface{}, head string, tail []string) (interface{}, error) {
-	switch value.(type) {
+	switch value := value.(type) {
 	case []interface{}:
 		if head == "*" {
-			return readArraySplat(value.([]interface{}), tail)
+			return readArraySplat(value, tail)
 		}
 		index, err := strconv.ParseInt(head, 10, 64)
 		if err != nil {
-			return nil, fmt.Errorf("Error accessing array: %v", err)
+			return nil, fmt.Errorf("error accessing array: %v", err)
 		}
-		return readArray(value.([]interface{}), index, tail)
+		return readArray(value, index, tail)
 	case yaml.MapSlice:
-		return readMap(value.(yaml.MapSlice), head, tail)
+		return readMap(value, head, tail)
 	default:
 		return nil, nil
 	}
diff --git a/data_navigator_test.go b/data_navigator_test.go
index 9a3fce0..adca0f3 100644
--- a/data_navigator_test.go
+++ b/data_navigator_test.go
@@ -92,7 +92,7 @@ b:
 	if err == nil {
 		t.Fatal("Expected error due to invalid path")
 	}
-	expectedOutput := `Error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
+	expectedOutput := `error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
 	assertResult(t, expectedOutput, err.Error())
 }
 
@@ -112,7 +112,7 @@ b:
 	if err == nil {
 		t.Fatal("Expected error due to invalid path")
 	}
-	expectedOutput := `Error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
+	expectedOutput := `error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
 	assertResult(t, expectedOutput, err.Error())
 }
 
@@ -132,7 +132,7 @@ b:
 	if err == nil {
 		t.Fatal("Expected error due to invalid path")
 	}
-	expectedOutput := `Error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
+	expectedOutput := `error accessing array: strconv.ParseInt: parsing "x": invalid syntax`
 	assertResult(t, expectedOutput, err.Error())
 }
 
diff --git a/json_converter.go b/json_converter.go
index a3f79df..081f9a6 100644
--- a/json_converter.go
+++ b/json_converter.go
@@ -17,16 +17,16 @@ func jsonToString(context interface{}) (string, error) {
 }
 
 func toJSON(context interface{}) interface{} {
-	switch context.(type) {
+	switch context := context.(type) {
 	case []interface{}:
-		oldArray := context.([]interface{})
+		oldArray := context
 		newArray := make([]interface{}, len(oldArray))
 		for index, value := range oldArray {
 			newArray[index] = toJSON(value)
 		}
 		return newArray
 	case yaml.MapSlice:
-		oldMap := context.(yaml.MapSlice)
+		oldMap := context
 		newMap := make(map[string]interface{})
 		for _, entry := range oldMap {
 			if str, ok := entry.Key.(string); ok {
diff --git a/merge.go b/merge.go
index 863bd0a..e80bce3 100644
--- a/merge.go
+++ b/merge.go
@@ -1,6 +1,6 @@
 package main
 
-import "gopkg.in/imdario/mergo.v0"
+import mergo "gopkg.in/imdario/mergo.v0"
 
 func merge(dst interface{}, src interface{}, overwrite bool, append bool) error {
 	if overwrite {
diff --git a/utils_test.go b/utils_test.go
index ffeb45f..7e4252f 100644
--- a/utils_test.go
+++ b/utils_test.go
@@ -10,7 +10,7 @@ import (
 	"testing"
 
 	yaml "gopkg.in/mikefarah/yaml.v2"
-	"gopkg.in/spf13/cobra.v0"
+	cobra "gopkg.in/spf13/cobra.v0"
 )
 
 type resulter struct {
diff --git a/yq.go b/yq.go
index 59adb65..700f15d 100644
--- a/yq.go
+++ b/yq.go
@@ -255,7 +255,7 @@ func readProperty(cmd *cobra.Command, args []string) error {
 			if errorReading == io.EOF {
 				log.Debugf("done %v / %v", currentIndex, docIndexInt)
 				if !updateAll && currentIndex <= docIndexInt {
-					return fmt.Errorf("Asked to process document index %v but there are only %v document(s)", docIndex, currentIndex)
+					return fmt.Errorf("asked to process document index %v but there are only %v document(s)", docIndex, currentIndex)
 				}
 				return nil
 			}
@@ -370,7 +370,7 @@ func mapYamlDecoder(updateData updateDataFn, encoder *yaml.Encoder) yamlDecoderF
 
 			if errorReading == io.EOF {
 				if !updateAll && currentIndex <= docIndexInt {
-					return fmt.Errorf("Asked to process document index %v but there are only %v document(s)", docIndex, currentIndex)
+					return fmt.Errorf("asked to process document index %v but there are only %v document(s)", docIndex, currentIndex)
 				}
 				return nil
 			} else if errorReading != nil {
@@ -589,9 +589,9 @@ func toString(context interface{}) (string, error) {
 }
 
 func yamlToString(context interface{}) (string, error) {
-	switch context.(type) {
+	switch context := context.(type) {
 	case string:
-		return context.(string), nil
+		return context, nil
 	default:
 		return marshalContext(context)
 	}