message: Fix href as well as badge link for Travis CI
diff: stripe-rust
  ===========
  -[![stripe-rust on Travis CI](https://travis-ci.org/rapiditynetworks/stripe-rs.svg?branch=master)](https://travis-ci.org/rapiditynetworks/stripe-rust)
  +[![stripe-rust on Travis CI](https://travis-ci.org/rapiditynetworks/stripe-rs.svg?branch=master)](https://travis-ci.org/rapiditynetworks/stripe-rs)
  [![stripe-rust on crates.io](https://img.shields.io/crates/v/stripe-rust.svg)](https://crates.io/crates/stripe-rust)
  [![stripe-rust on docs.rs](https://docs.rs/stripe-rust/badge.svg)](https://docs.rs/stripe-rust)
  