build: upgrade to Go 1.18.1 (#373)

pkg/csv2lp/csv2lp.go

@@ -148,10 +148,8 @@ func (state *CsvToLineReader) Read(p []byte) (n int, err error) {
 			// detect non-standard line endings in header lines #106
 			for _, col := range row {
 				if idx := strings.Index(col, "\r"); idx >= 0 && idx+1 < len(col) && col[idx+1] != '\n' {
-					log.Println(
-						fmt.Sprintf("WARNING: %v. Only CRLF and LF line endings are supported.",
-							CsvLineError{state.LineNumber, errors.New("standalone CR character found")},
-						),
+					log.Printf("WARNING: %v. Only CRLF and LF line endings are supported.\n",
+						CsvLineError{state.LineNumber, errors.New("standalone CR character found")},
 					)
 					break
 				}

pkg/csv2lp/data_conversion.go

@@ -283,9 +283,7 @@ func createBoolParseFn(format string) func(string) (interface{}, error) {
 	if !strings.Contains(format, ":") {
 		err = fmt.Errorf("unsupported boolean format: %s should be in 'true,yes,1:false,no,0' format, but no ':' is present", format)
 	} else {
-		colon := strings.Index(format, ":")
-		t := format[:colon]
-		f := format[colon+1:]
+		t, f, _ := strings.Cut(format, ":")
 		if t != "" {
 			truthy = strings.Split(t, ",")
 		}

pkg/signals/context_test.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 package signals