add code coverage github action (#134)

.github/workflows/pr.yml

@@ -1,6 +1,7 @@
 name: PR sanity check
 
-on: pull_request
+on:
+  - push
 
 jobs:
   prcheck:
@@ -20,4 +21,6 @@ jobs:
       with:
         version: latest
     - name: Run tests
-      run: go test -v .
+      run: go test -race -covermode=atomic -coverprofile=coverage.out -v .
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3

README.md

@@ -1,6 +1,7 @@
 # Go OpenAI
 [![GoDoc](http://img.shields.io/badge/GoDoc-Reference-blue.svg)](https://godoc.org/github.com/sashabaranov/go-openai)
 [![Go Report Card](https://goreportcard.com/badge/github.com/sashabaranov/go-openai)](https://goreportcard.com/report/github.com/sashabaranov/go-openai)
+[![codecov](https://codecov.io/gh/sashabaranov/go-openai/branch/master/graph/badge.svg?token=bCbIfHLIsW)](https://codecov.io/gh/sashabaranov/go-openai)
 
 > **Note**: the repository was recently renamed from `go-gpt3` to `go-openai`