fix: fixed links in cargo and license buttons

Author: Vinatorul

README.md

@@ -1,6 +1,6 @@
 # clap
 
-![Travis-CI](https://travis-ci.org/kbknapp/clap-rs.svg?branch=master) [![Crates.io](https://img.shields.io/crates/v/clap.svg)]() [![Crates.io](https://img.shields.io/crates/l/clap.svg)]() [![Join the chat at https://gitter.im/kbknapp/clap-rs](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/kbknapp/clap-rs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+![Travis-CI](https://travis-ci.org/kbknapp/clap-rs.svg?branch=master) [![Crates.io](https://img.shields.io/crates/v/clap.svg)](https://crates.io/crates/clap) [![Crates.io](https://img.shields.io/crates/l/clap.svg)](LICENSE-MIT) [![Join the chat at https://gitter.im/kbknapp/clap-rs](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/kbknapp/clap-rs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 Command Line Argument Parser for Rust