Merge pull request #262 from karthikkaiplody/master

Fixed the broken Penn Treebank Project link.

README.md

@@ -67,7 +67,7 @@ _Please read the [contribution guidelines](contributing.md) before contributing.
 * [NLP research group, Columbia University](http://www1.cs.columbia.edu/nlp/index.cgi) - Responsible for creating BOLT ( interactive error handling for speech translation systems) and an un-named project to characterize laughter in dialogue.
 * [The Center or Language and Speech Processing, John Hopkins University](http://clsp.jhu.edu/) - Recently in the news for developing speech recognition software to create a diagnostic test or Parkinson's Disease, [here](https://www.clsp.jhu.edu/2019/03/27/speech-recognition-software-and-machine-learning-tools-are-being-used-to-create-diagnostic-test-for-parkinsons-disease/#.XNFqrIkzYdU).
 * [Computational Linguistics and Information Processing Group, University of Maryland](https://wiki.umiacs.umd.edu/clip/index.php/Main_Page) - Notable contributions include [Human-Computer Cooperation or Word-by-Word Question Answering](http://www.umiacs.umd.edu/~jbg/projects/IIS-1652666) and modeling development of phonetic representations. 
-* [Penn Natural Language Processing, University of Pennsylvania](https://nlp.cis.upenn.edu/)- Famous for creating the [Penn Treebank](http://www.cis.upenn.edu/~treebank/).
+* [Penn Natural Language Processing, University of Pennsylvania](https://nlp.cis.upenn.edu/)- Famous for creating the [Penn Treebank](https://www.seas.upenn.edu/~pdtb/).
 * [The Stanford Nautral Language Processing Group](https://nlp.stanford.edu/)- One of the top NLP research labs in the world, notable for creating [Stanford CoreNLP](https://nlp.stanford.edu/software/corenlp.shtml) and their [coreference resolution system](https://nlp.stanford.edu/software/dcoref.shtml)