Add v2 to the URL (#634)

so that it reflects the current URL schema

README.md

@@ -7,7 +7,7 @@
 
 
 <p align="center">
-<a href="https://goreportcard.com/report/github.com/projectdiscovery/subfinder"><img src="https://goreportcard.com/badge/github.com/projectdiscovery/subfinder"></a>
+<a href="https://goreportcard.com/report/github.com/projectdiscovery/subfinder/v2"><img src="https://goreportcard.com/badge/github.com/projectdiscovery/subfinder"></a>
 <a href="https://github.com/projectdiscovery/subfinder/issues"><img src="https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat"></a>
 <a href="https://github.com/projectdiscovery/subfinder/releases"><img src="https://img.shields.io/github/release/projectdiscovery/subfinder"></a>
 <a href="https://twitter.com/pdiscoveryio"><img src="https://img.shields.io/twitter/follow/pdiscoveryio.svg?logo=twitter"></a>