fix gitter link

Author: baev

README.rst

@@ -2,7 +2,7 @@ Allure Python Integrations
 ==========================
 The repository contains adaptors for python-based test frameworks.
 Documentation is available `online <https://docs.qameta.io/allure/2.0/)>`_, also you can get help at
-`gitter chanel <https://gitter.im/allure-framework/allure-core)>`_
+`gitter chanel <https://gitter.im/allure-framework/allure-core>`_
 
 
 Pytest