drop 3.3 and 3.4

Author: artofhuman

.travis.yml

@@ -2,9 +2,9 @@ language: python
 sudo: false
 python:
 - 2.7
-- 3.3
-- 3.4
 - 3.5
+- 3.6
+- 3.7
 cache: pip
 install:
 - pip install -r ./dev_requirements.txt