added bages

README.md

+[pypi-image]: https://badge.fury.io/py/torch-unique.svg
+[pypi-url]: https://pypi.python.org/pypi/torch-unique
+[build-image]: https://travis-ci.org/rusty1s/pytorch_unique.svg?branch=master
+[build-url]: https://travis-ci.org/rusty1s/pytorch_unique
+[coverage-image]: https://codecov.io/gh/rusty1s/pytorch_unique/branch/master/graph/badge.svg
+[coverage-url]: https://codecov.io/github/rusty1s/pytorch_unique?branch=master
+
 # PyTorch Sparse
+
+[![PyPI Version][pypi-image]][pypi-url]
+[![Build Status][build-image]][build-url]
+[![Code Coverage][coverage-image]][coverage-url]
+
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