Update gevent to 1.3.6 to support python 3.7 (#111)

* Update requirements.txt

* Update import

* Update tests to run on 3.7

* Update .travis.yml

* Try workaround recommended here https://github.com/travis-ci/travis-ci/issues/9815

.travis.yml

@@ -6,6 +6,12 @@ python:
   - '2.7'
   - '3.6'
 
+matrix:
+  include:
+  - python: 3.7
+    dist: xenial
+    sudo: true
+
 install:
   - pip install -U pip setuptools
   - pip install -U pytest flake8-tuple flake8-quotes flake8-comprehensions flake8-commas flake8-builtins

disco/bot/bot.py

@@ -7,7 +7,7 @@ import importlib
 
 from six.moves import reload_module
 from holster.threadlocal import ThreadLocal
-from gevent.wsgi import WSGIServer
+from gevent.pywsgi import WSGIServer
 
 from disco.types.guild import GuildMember
 from disco.bot.plugin import Plugin

requirements.txt

@@ -1,4 +1,4 @@
-gevent==1.2.2
+gevent==1.3.6
 holster==2.0.0
 requests==2.18.4
 six==1.11.0