drop python 2.6 support

Aliaksandr Trush · Aliaksandr Trush · commit 4c6c0fb6917f · 2018-09-07T15:05:06.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,7 +4,6 @@ stages:
   if: tag IS present
 language: python
 python:
-  - "2.6"
   - "2.7"
   - "3.4"
   - "3.5"
