Use Python 3.6.

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.5-slim
+FROM python:3.6-slim
 MAINTAINER Jannis Leidel <jezdez@mozilla.com>
 
 ENV PYTHONUNBUFFERED=1 \

Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM python:3.5-slim
+FROM python:3.6-slim
 MAINTAINER Jannis Leidel <jezdez@mozilla.com>
 
 ENV PYTHONUNBUFFERED=1 \

runtime.txt

@@ -1 +1 @@
-python-3.5.2
+python-3.6.1

setup.py

@@ -18,7 +18,7 @@ setup(
         'License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Scientific/Engineering :: Information Analysis'
     ],