Upgrade setuptools version and use native docutils

environment.yml

@@ -4,7 +4,7 @@ dependencies:
 - pip=8.1.1=py35_0
 - python=3.5.1=0
 - readline=6.2=2
-- setuptools=20.3=py35_0
+- setuptools=40.4.3=py35_0
 - sqlite=3.9.2=0
 - tk=8.5.18=0
 - wheel=0.29.0=py35_0
@@ -18,4 +18,4 @@ dependencies:
   - websockets>=6.0
   - sphinxcontrib-asyncio>=0.2.0
   - multidict>=4.0,<5.0
-  - https://github.com/channelcat/docutils-fork/zipball/master
+  - docutils==0.14