golangci-lint configuration file

golangci-lint can run all the currently enabled linters, and as far as I
can tell, does it in under 5 seconds as opposed to over 180 seconds
(compare `time make cilint` and `time make lint`).

Some of the linters that are listed in the "enabled" section but
commented out looked like a good idea to me, and fairly low hanging
fruit to fix, but they are not passing at the moment.

All the linters covered in the current Makefile are run.

TODO:
- replace lint target in Makefile with golangci-lint
- remove .github/workflow/errcheck.yml

modules/digitalclock/clocks.go

@@ -13,7 +13,7 @@ const AM = "A"
 const PM = "P"
 const minRowsForBorder = 3
 
-// Converts integer to string along with makes sure the lenght of string is > 2
+// Converts integer to string along with makes sure the length of string is > 2
 func intStrConv(val int) string {
 	valStr := strconv.Itoa(val)
 
@@ -39,9 +39,9 @@ func getHourMinute(hourFormat string) string {
 
 	}
 
-	strMintues := intStrConv(time.Now().Minute())
-	strMintues = strMintues + AMPM
-	return strHours + getColon() + strMintues
+	strMinutes := intStrConv(time.Now().Minute())
+	strMinutes += AMPM
+	return strHours + getColon() + strMinutes
 }
 
 // Returns the : with blinking based on the seconds

modules/digitalclock/display.go

@@ -3,7 +3,7 @@ package digitalclock
 import "strings"
 
 func mergeLines(outString []string) string {
-	return strings.Join(outString[:], "\n")
+	return strings.Join(outString, "\n")
 }
 
 func renderWidget(widgetSettings Settings) string {