add go reference badge

Author: siherrmann

.github/workflows/coverage.yml

@@ -22,3 +22,7 @@ jobs:
         run: go test -v ./...
       - name: Update coverage report
         uses: ncruces/go-coverage-report@v0
+        with:
+          report: true
+          chart: true
+          amend: true

README.md

@@ -1,5 +1,6 @@
 # queuer
 
+[![Go Reference](https://pkg.go.dev/badge/github.com/siherrmann/queuer.svg)](https://pkg.go.dev/github.com/siherrmann/queuer)
 [![Go Coverage](https://github.com/siherrmann/queuer/wiki/coverage.svg)](https://raw.githack.com/wiki/siherrmann/queuer/coverage.html)
 
 Queueing package based on postgres written in Go.