Update README.md

Author: escherba

README.md

@@ -7,8 +7,6 @@ fast non-cryptographic hash function.
 [![Latest
 Version](https://img.shields.io/pypi/v/metrohash.svg)](https://pypi.python.org/pypi/metrohash)
 [![Downloads](https://img.shields.io/pypi/dm/metrohash.svg)](https://pypistats.org/packages/metrohash)
-[![Tests
-Status](https://circleci.com/gh/escherba/python-metrohash.png?style=shield)](https://circleci.com/gh/escherba/python-metrohash)
 [![License](https://img.shields.io/pypi/l/cityhash.svg)](https://pypi.python.org/pypi/cityhash)
 [![Supported Python
 versions](https://img.shields.io/pypi/pyversions/cityhash.svg)](https://pypi.python.org/pypi/cityhash)