Integrate codecov. Fixes #90 (#91)

# Describe Request

Integrate codecov. Fixes #90

# Change Type

Maintenance change.

.github/workflows/go.yml

@@ -38,6 +38,11 @@ jobs:
     - name: Go test
       run: go test -v -coverprofile=coverage.out ./...
 
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+
     - name: Go coverage
       env:
         CODE_COVERAGE_THRESHOLD: 100

README.md

@@ -1,7 +1,8 @@
 [![GoDoc](https://godoc.org/github.com/cinar/checker?status.svg)](https://godoc.org/github.com/cinar/checker)
 [![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
-![Go CI](https://github.com/cinar/checker/actions/workflows/go.yml/badge.svg)
 [![Go Report Card](https://goreportcard.com/badge/github.com/cinar/checker)](https://goreportcard.com/report/github.com/cinar/checker)
+![Go CI](https://github.com/cinar/checker/actions/workflows/go.yml/badge.svg)
+[![codecov](https://codecov.io/gh/cinar/checker/branch/main/graph/badge.svg?token=VO9BYBHJHE)](https://codecov.io/gh/cinar/checker)
 
 # Checker