Added DeepSource badge

README.md

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 # rest
 [![Go Report Card](https://goreportcard.com/badge/github.com/pczajkowski/rest)](https://goreportcard.com/report/github.com/pczajkowski/rest)
+[![DeepSource](https://deepsource.io/gh/pczajkowski/rest.svg/?label=active+issues&show_trend=true)](https://deepsource.io/gh/pczajkowski/rest/?ref=repository-badge)
 
 Bunch of methods which help me in my daily battle with REST APIs.