Add FOSSA badge

Author: yurishkuro

README.md

@@ -1,4 +1,4 @@
-[![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov] [![PyPI version][pypi-img]][pypi]
+[![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov] [![PyPI version][pypi-img]][pypi] [![FOSSA Status][fossa-img]][fossa]
 
 # Jaeger Bindings for Python OpenTracing API 
 
@@ -153,3 +153,5 @@ We will welcome PRs that provide that functionality.
 [cov]: https://coveralls.io/github/jaegertracing/jaeger-client-python?branch=master
 [pypi-img]: https://badge.fury.io/py/jaeger-client.svg
 [pypi]: https://badge.fury.io/py/jaeger-client
+[fossa-img]: https://app.fossa.io/api/projects/git%2Bgithub.com%2Fjaegertracing%2Fjaeger-client-python.svg?type=shield
+[fossa]: https://app.fossa.io/projects/git%2Bgithub.com%2Fjaegertracing%2Fjaeger-client-python?ref=badge_shield