Add travis build badge

README.md

@@ -1,5 +1,8 @@
 cheat
 =====
+
+[![Build Status](https://travis-ci.com/cheat/cheat.svg?branch=master)](https://travis-ci.com/cheat/cheat)
+
 `cheat` allows you to create and view interactive cheatsheets on the
 command-line. It was designed to help remind \*nix system administrators of
 options for commands that they use frequently, but not frequently enough to
@@ -22,7 +25,7 @@ cheat tar
 You will be presented with a cheatsheet resembling the following:
 
 ```sh
-# To extract an uncompressed archive: 
+# To extract an uncompressed archive:
 tar -xvf '/path/to/foo.tar'
 
 # To extract a .gz archive: