Merge pull request keon#238 from khuyentran1401/master

add topic modeling library

Author: NirantK

README.md

@@ -162,6 +162,7 @@ Blogs and Newsletters
   - [Transformers](https://github.com/huggingface/transformers) - Natural Language Processing for TensorFlow 2.0 and PyTorch.
   - [Tokenizers](https://github.com/huggingface/tokenizers) - Tokenizers optimized for Research and Production.
   - [fairSeq](https://github.com/pytorch/fairseq) Facebook AI Research implementations of SOTA seq2seq models in Pytorch. 
+  - [corex_topic](https://github.com/gregversteeg/corex_topic) - Hierarchical Topic Modeling with Minimal Domain Knowledge  
 
 - <a id="c++">**C++** - C++ Libraries</a> | [Back to Top](#contents)
   - [MIT Information Extraction Toolkit](https://github.com/mit-nlp/MITIE) - C, C++, and Python tools for named entity recognition and relation extraction