Remove 1.0.1 version requirement for mock from the conda install.

Author: ostrokach

readthedocs/doc_builder/python_environments.py

@@ -190,7 +190,7 @@ def install_core_requirements(self):
             'sphinx==1.3.1',
             'Pygments==2.0.2',
             'docutils==0.12',
-            'mock==1.0.1',
+            'mock',
             'pillow==3.0.0',
             'sphinx_rtd_theme==0.1.7',
             'alabaster>=0.7,<0.8,!=0.7.5',