Version update to 2.6.0

Author: maximdanilchenko

setup.py

@@ -48,7 +48,7 @@ def read(fname):
 
 setup_opts = dict(
     name='aiochclient',
-    version='2.5.1',
+    version='2.6.0',
     description='Async http clickhouse client for python 3.6+',
     long_description=read('README.md'),
     long_description_content_type="text/markdown",