Fix README.md broken links and retire SLA

README.md

@@ -1,9 +1,6 @@
 # cirello.io/oversight
 
-[![GoDoc](https://godoc.org/cirello.io/oversight?status.svg)](https://godoc.org/cirello.io/oversight)
-[![gocover.io](https://gocover.io/_badge/cirello.io/oversight)](https://gocover.io/cirello.io/oversight)
-[![Go Report Card](https://goreportcard.com/badge/github.com/cirello-io/oversight)](https://goreportcard.com/report/github.com/cirello-io/oversight)
-[![SLA](https://img.shields.io/badge/SLA-95%25-brightgreen.svg)](https://github.com/cirello-io/public/blob/master/SLA.md)
+[![Go Reference](https://pkg.go.dev/badge/cirello.io/oversight.svg)](https://pkg.go.dev/cirello.io/oversight)
 
 Package oversight makes a complete implementation of the Erlang supervision
 trees.
@@ -12,7 +9,7 @@ Refer to: http://erlang.org/doc/design_principles/sup_princ.html
 
 go get [-u -f] cirello.io/oversight
 
-http://godoc.org/cirello.io/oversight
+https://godoc.org/cirello.io/oversight
 
 
 ## Quickstart