Use errors.Is() rather than comparing errors using ==

Humor the linter.

Author: mhagger

git-sizer.go

@@ -190,7 +190,7 @@ func mainImplementation(stdout, stderr io.Writer, args []string) error {
 
 	err = flags.Parse(args)
 	if err != nil {
-		if err == pflag.ErrHelp {
+		if errors.Is(err, pflag.ErrHelp) {
 			return nil
 		}
 		return err

internal/pipe/pipeline.go

@@ -204,7 +204,7 @@ func (p *Pipeline) Wait() error {
 			finishedEarly = false
 			continue
 
-		case err == FinishEarly:
+		case errors.Is(err, FinishEarly):
 			// We ignore `FinishEarly` errors because that is how a
 			// stage informs us that it intentionally finished early.
 			// Moreover, if we see a `FinishEarly` error, ignore any