write a canonical header for machine-generated files

Signed-off-by: Denys Smirnov <denys@sourced.tech>

internal/code-generator/generator/linguist-commit.go

@@ -2,16 +2,13 @@ package generator
 
 import (
 	"bytes"
-	"text/template"
 )
 
 // Commit takes a commit and builds the source file from tmplPath. It complies with type File signature.
 func Commit(fileToParse, samplesDir, outPath, tmplPath, tmplName, commit string) error {
 	buf := &bytes.Buffer{}
-	t := template.Must(template.New(tmplName).ParseFiles(tmplPath))
-	if err := t.Execute(buf, commit); err != nil {
+	if err := executeTemplate(buf, tmplName, tmplPath, commit, nil, nil); err != nil {
 		return err
 	}
-
 	return formatedWrite(outPath, buf.Bytes())
 }