Merge pull request #4 from fgm/3-readme-missing-link-to-online-godoc

Issue #3: add a godoc / pkg.go.dev badge/link. Fix Cobra example.

README.md

@@ -1,5 +1,6 @@
 # HTTP Headers for spf13/pflag
 
+[![Go Reference](https://pkg.go.dev/badge/pkg.go.dev/github.com/fgm/pflagheaders.svg)](https://pkg.go.dev/github.com/fgm/pflagheaders)
 [![fgm](https://circleci.com/gh/fgm/pflagheaders.svg?style=shield)](https://app.circleci.com/pipelines/github/fgm/pflagheaders)
 [![codecov](https://codecov.io/gh/fgm/pflagheaders/branch/main/graph/badge.svg?token=O6LQF0BGGF)](https://codecov.io/gh/fgm/pflagheaders)
 [![Go Report Card](https://goreportcard.com/badge/github.com/fgm/pflagheaders)](https://goreportcard.com/report/github.com/fgm/pflagheaders)
@@ -64,7 +65,7 @@ var header = &pfh.Header{}
 
 var rootCmd = &cobra.Command{
 	/* generated by Cobra */
-	Run: func(_ *cobra.Command, _ []string) { fmt.Println(h.Header) }
+	Run: func(_ *cobra.Command, _ []string) { fmt.Println(header) }
 }
 
 func init() {