Document exceptions and change conf.py version detection.

docs/conf.py

@@ -14,6 +14,7 @@
 
 import sys
 import os
+import re
 
 # 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
@@ -53,9 +54,13 @@ copyright = u'2015, Rapptz'
 # built documents.
 #
 # The short X.Y version.
-version = '0.4.0'
+
+version = ''
+with open('../discord/__init__.py') as f:
+    version = re.search(r'^__version__\s*=\s*[\'"]([^\'"]*)[\'"]', f.read(), re.MULTILINE).group(1)
+
 # The full version, including alpha/beta/rc tags.
-release = '0.4.0'
+release = version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.