Fix missing parenthesis

Author: samcv

Diff for: README.markdown

@@ -1,6 +1,6 @@
 # [Learn X in Y minutes][1]
 
-[![Build Status](https://travis-ci.org/adambard/learnxinyminutes-docs.svg?branch=master](https://travis-ci.org/adambard/learnxinyminutes-docs)
+[![Build Status](https://travis-ci.org/adambard/learnxinyminutes-docs.svg?branch=master)](https://travis-ci.org/adambard/learnxinyminutes-docs)
 
 Whirlwind tours of (several, hopefully many someday) popular and
 ought-to-be-more-popular programming languages, presented as valid, commented