fix: Remove timestamp from generated files

We don't need to know when the file was generated so it makes no sense
to keep the timestamp.

cmd/gen/main.go

@@ -17,7 +17,6 @@ import (
 	"regexp"
 	"strings"
 	"text/template"
-	"time"
 	"unicode"
 )
 
@@ -43,7 +42,6 @@ func main() {
 	// Start writing with the header.
 	err = headTempl.Execute(&b, headVars{
 		Command:     "gen",
-		Timestamp:   time.Now().UTC(),
 		PackageName: path.Base(cwd),
 	})
 	if err != nil {
@@ -169,14 +167,12 @@ func getFuncVars(line string) funcVars {
 
 type headVars struct {
 	Command     string
-	Timestamp   time.Time
 	PackageName string
 }
 
 var headTempl = template.Must(template.New("").Parse(`
 // Code generated by "{{.Command}}"; DO NOT EDIT.
 // This file is meant to be re-generated in place and/or deleted at any time.
-// Last generated at {{.Timestamp}}
 package {{.PackageName}}
 
 import (