Update README.md

README.md

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 # SentencePiece
 
-[![Build Status](https://travis-ci.org/google/sentencepiece.svg?branch=master)](https://travis-ci.org/google/sentencepiece) [![Coverage Status](https://coveralls.io/repos/github/google/sentencepiece/badge.svg?branch=master)](https://coveralls.io/github/google/sentencepiece?branch=master)
+[![Build Status](https://travis-ci.org/google/sentencepiece.svg?branch=master)](https://travis-ci.org/google/sentencepiece) 
+[![Coverage Status](https://coveralls.io/repos/github/google/sentencepiece/badge.svg?branch=master)](https://coveralls.io/github/google/sentencepiece?branch=master)
+[![PyPI version](https://badge.fury.io/py/sentencepiece.svg)](https://badge.fury.io/py/sentencepiece)
+[![Contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg)](CONTRIBUTING.md)
+[![License](https://img.shields.io/badge/License-Apache%202.0-brightgreen.svg)](https://opensource.org/licenses/Apache-2.0)
 
 SentencePiece is an unsupervised text tokenizer and detokenizer mainly for
 Neural Network-based text generation systems where the vocabulary size