Merge pull request #1759 from bitprophet/patch-1

Version-lock unlocked dependencies

setup.py

@@ -51,9 +51,9 @@ requires = [
     'Pygments>=2.0',
     'docutils>=0.11',
     'snowballstemmer>=1.1',
-    'babel',
-    'alabaster',
-    'sphinx_rtd_theme',
+    'babel>=1.3',
+    'alabaster>=0.7,<0.8',
+    'sphinx_rtd_theme>=0.1,<0.2',
 ]
 extras_require = {
     # Environment Marker works for wheel 0.24 or later