Fix CI badge

Author: kyleconroy

README.md

@@ -1,5 +1,5 @@
 [![Go Reference](https://pkg.go.dev/badge/github.com/tabbed/pqtype.svg)](https://pkg.go.dev/github.com/tabbed/pqtype)
-![CI](https://github.com/tabbed/pqtype/workflows/ci/badge.svg)
+[![go](https://github.com/tabbed/pqtype/actions/workflows/ci.yml/badge.svg)](https://github.com/tabbed/pqtype/actions/workflows/ci.yml)
 
 # pqtype