chore: update readme

Author: carlosmiei

README.rst

@@ -8,9 +8,6 @@ Welcome to python-kucoin v2.1.3
 .. image:: https://img.shields.io/pypi/l/python-kucoin.svg
     :target: https://pypi.python.org/pypi/python-kucoin
 
-.. image:: https://img.shields.io/travis/sammchardy/python-kucoin.svg
-    :target: https://travis-ci.org/sammchardy/python-kucoin
-
 .. image:: https://img.shields.io/coveralls/sammchardy/python-kucoin.svg
     :target: https://coveralls.io/github/sammchardy/python-kucoin