Update README.md

Author: PhilJay

README.md

@@ -111,7 +111,7 @@ If you like this library, please tell others about it :two_hearts: :two_hearts:
 [![Share on Google+](https://github.com/PhilJay/MPAndroidChart/blob/master/design/googleplus_icon.png)](https://plus.google.com/share?url=https://github.com/PhilJay/MPAndroidChart)
 [![Share on Facebook](https://github.com/PhilJay/MPAndroidChart/blob/master/design/facebook_icon.png)](https://www.facebook.com/sharer/sharer.php?u=https://github.com/PhilJay/MPAndroidChart)
 
-If you like, you can follow me on Twitter [**@PhilippJahoda**].
+If you like, you can follow me on Twitter [**@PhilippJahoda**](https://twitter.com/PhilippJahoda).
 
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