docs: Fix markdown link (#32)

Author: andreypopp

README.md

@@ -1,7 +1,6 @@
 # react-container-dimensions [![Build Status](https://travis-ci.org/okonet/react-container-dimensions.svg?branch=master)](https://travis-ci.org/okonet/react-container-dimensions) [![npm version](https://badge.fury.io/js/react-container-dimensions.svg)](https://badge.fury.io/js/react-container-dimensions)
 Wrapper component that detects parent (container) element resize and passes new dimensions down the 
-tree. Based on [element-resize-detector]
-(https://github.com/wnr/element-resize-detector)
+tree. Based on [element-resize-detector](https://github.com/wnr/element-resize-detector).
 
 `npm install --save react-container-dimensions`