fix Go Report Card URL
<a href="https://github.com/haya14busa/reviewdog/blob/master/LICENSE">
<img alt="LICENSE" src="https://img.shields.io/badge/license-MIT-blue.svg">
</a>
- <a href="https://goreportcard.com/badge/github.com/haya14busa/reviewdog">
- <img alt="Go Report Card" src="https://goreportcard.com/report/github.com/haya14busa/reviewdog">
+ <a href="https://goreportcard.com/report/github.com/haya14busa/reviewdog">
+ <img alt="Go Report Card" src="https://goreportcard.com/badge/github.com/haya14busa/reviewdog">
</a>
<a href="https://godoc.org/github.com/haya14busa/reviewdog">
<img alt="GoDoc" src="https://godoc.org/github.com/haya14busa/reviewdog?status.svg">
