Fix typo in the link name

Author: yurishkuro

README.md

@@ -167,6 +167,6 @@ Please make sure your framework does the same.
 [pypi-img]: https://badge.fury.io/py/jaeger-client.svg
 [pypi]: https://badge.fury.io/py/jaeger-client
 [pythonversion-img]: https://img.shields.io/pypi/pyversions/jaeger-client.svg
-[pytonversion]: https://pypi.org/project/jaeger-client
+[pythonversion]: https://pypi.org/project/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