Remove long-obsolete Travis CI badge from "README.md" file

README.md

@@ -1,6 +1,5 @@
 # cargo-modules
 
-[![Build Status](http://img.shields.io/travis/regexident/cargo-modules.svg?style=flat-square)](https://travis-ci.org/regexident/cargo-modules)
 [![Downloads](https://img.shields.io/crates/d/cargo-modules.svg?style=flat-square)](https://crates.io/crates/cargo-modules/)
 [![Version](https://img.shields.io/crates/v/cargo-modules.svg?style=flat-square)](https://crates.io/crates/cargo-modules/)
 [![License](https://img.shields.io/crates/l/cargo-modules.svg?style=flat-square)](https://crates.io/crates/cargo-modules/)