CI: Turn off testing of Python 3.3 and 3.4.

Since we don't backport new features in asyncio in Python 3.4 and 3.3,
and only keep this repo in sync with Python 3.5, it doesn't make any
sense to test against old versions.

Author: 1st1

.travis.yml

@@ -4,8 +4,6 @@ os:
   - linux
 
 python:
-    - 3.3
-    - 3.4
     - 3.5
 
 install:

appveyor.yml

@@ -1,7 +1,5 @@
 environment:
   matrix:
-    - PYTHON: "C:\\Python34"
-    - PYTHON: "C:\\Python34-x64"
     - PYTHON: "C:\\Python35"
     - PYTHON: "C:\\Python35-x64"