Fix readthedocs build

dean0x7d · wjakob · commit cec052b5c5a7 · 2017-02-14T11:39:03.000+01:00
Fixes #667 The sphinx version is pinned by readthedocs, but sphinx 1.3.5 is not available with conda python 3.6. The workaround is to pin the python version to 3.5 (it doesn't really matter for the docs build).
diff --git a/docs/environment.yml b/docs/environment.yml
@@ -3,6 +3,7 @@ channels:
 - dean0x7d
 - defaults
 dependencies:
+- python==3.5
 - doxygen
 - pip
 - pip:
