Migrate from gocover

Fixes #142

.github/workflows/go.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ["1.17"]
+        go: ["1.17", "1.21"]
     steps:
 
     - name: Set up Go ${{ matrix.go }}
@@ -24,3 +24,14 @@ jobs:
 
     - name: Test
       run: go test ./...
+
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Update coverage report
+      uses: ncruces/go-coverage-report@main
+      with:
+        report: 'true'
+        chart: 'true'
+        amend: 'true'
+     continue-on-error: true

README.md

@@ -1,4 +1,4 @@
-# Go CORS handler [![godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/rs/cors) [![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/rs/cors/master/LICENSE) [![build](https://img.shields.io/travis/rs/cors.svg?style=flat)](https://travis-ci.org/rs/cors) [![Coverage](http://gocover.io/_badge/github.com/rs/cors)](http://gocover.io/github.com/rs/cors)
+# Go CORS handler [![godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/rs/cors) [![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/rs/cors/master/LICENSE) [![build](https://img.shields.io/travis/rs/cors.svg?style=flat)](https://travis-ci.org/rs/cors) [![Go Coverage](https://github.com/rs/cors/wiki/coverage.svg)](https://raw.githack.com/wiki/rs/cors/coverage.html)
 
 CORS is a `net/http` handler implementing [Cross Origin Resource Sharing W3 specification](http://www.w3.org/TR/cors/) in Golang.