Update CI badge in README

README.md

@@ -1,6 +1,6 @@
 # protoc-gen-doc
 
-[![Travis Build Status][travis-svg]][travis-ci]
+[![CI Status][ci-svg]][ci-url]
 [![codecov][codecov-svg]][codecov-url]
 [![GoDoc][godoc-svg]][godoc-url]
 [![Go Report Card][goreport-svg]][goreport-url]
@@ -191,15 +191,11 @@ Check out the `examples` task in the [Makefile](Makefile) to see how these were
 [html_preview]:
     https://rawgit.com/pseudomuto/protoc-gen-doc/master/examples/doc/example.html
     "HTML Example Output"
-[travis-svg]:
-    https://travis-ci.org/pseudomuto/protoc-gen-doc.svg?branch=master
-    "Travis CI build status SVG"
-[travis-ci]:
-    https://travis-ci.org/pseudomuto/protoc-gen-doc
-    "protoc-gen-doc at Travis CI"
 [codecov-svg]: https://codecov.io/gh/pseudomuto/protoc-gen-doc/branch/master/graph/badge.svg
 [codecov-url]: https://codecov.io/gh/pseudomuto/protoc-gen-doc
 [godoc-svg]: https://godoc.org/github.com/pseudomuto/protoc-gen-doc?status.svg
 [godoc-url]: https://godoc.org/github.com/pseudomuto/protoc-gen-doc
 [goreport-svg]: https://goreportcard.com/badge/github.com/pseudomuto/protoc-gen-doc
 [goreport-url]: https://goreportcard.com/report/github.com/pseudomuto/protoc-gen-doc
+[ci-svg]: https://github.com/pseudomuto/protoc-gen-doc/actions/workflows/ci.yaml/badge.svg?branch=master
+[ci-url]: https://github.com/pseudomuto/protoc-gen-doc/actions/workflows/ci.yaml