use python3.6 (#100)

Author: cclauss

.travis.yml

@@ -1,8 +1,8 @@
 sudo: false
 language: python
-python: 3.5
+python: 3.6
 env:
-    - TOXENV=py35
+    - TOXENV=py36
     - TOXENV=pep8
 
 install:

tox.ini

@@ -1,13 +1,13 @@
 [tox]
-envlist = py35,pep8
+envlist = py36,pep8
 
 [testenv]
 deps =
     -rrequirements.txt
 commands = python check_https.py
 
 [testenv:pep8]
-basepython = python3.5
+basepython = python3.6
 deps = flake8
 commands = flake8 check_https.py