Update dependencies to latest versions

vendor/github.com/gdamore/encoding/.travis.yml

@@ -1,6 +1,7 @@
 language: go
 
 go:
-  - 1.3
-  - 1.5
+  - 1.9.x
+  - 1.10.x
+  - 1.11.x
   - tip

vendor/github.com/gdamore/encoding/charmap.go

@@ -18,8 +18,8 @@ import (
 	"sync"
 	"unicode/utf8"
 
-	"golang.org/x/text/transform"
 	"golang.org/x/text/encoding"
+	"golang.org/x/text/transform"
 )
 
 const (
@@ -135,8 +135,12 @@ func (c *Charmap) NewDecoder() *encoding.Decoder {
 // 8-bit character set.  Unknown mappings are mapped to 0x1A.
 func (c *Charmap) NewEncoder() *encoding.Encoder {
 	c.Init()
-	return &encoding.Encoder{Transformer:
-	    &cmapEncoder{bytes: c.bytes, replace: c.ReplacementChar}}
+	return &encoding.Encoder{
+		Transformer: &cmapEncoder{
+			bytes:   c.bytes,
+			replace: c.ReplacementChar,
+		},
+	}
 }
 
 func (d *cmapDecoder) Transform(dst, src []byte, atEOF bool) (int, int, error) {

vendor/github.com/gdamore/encoding/go.mod

@@ -0,0 +1,5 @@
+module github.com/gdamore/encoding
+
+go 1.9
+
+require golang.org/x/text v0.3.0

vendor/github.com/gdamore/encoding/go.sum

@@ -0,0 +1,2 @@
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=