conf.py: Use version in coalib.__version__

The coala version is stuck at 0.8.
Import latest released coalib and use the version it exposes.

Fixes coala#327

conf.py

@@ -16,6 +16,8 @@
 import sys
 import os
 
+import coalib
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
@@ -57,9 +59,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.8.0'
+version = coalib.__version__
 # The full version, including alpha/beta/rc tags.
-release = '0.8.0'
+release = coalib.__version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

docs-requirements.txt

@@ -1 +1,2 @@
+coala
 sphinx~=1.4.9