Revert "Change docs to pull version from setup.py"

This reverts commit 45b70c952f.
This commit broke the readthedocs build because RTD is building the docs
without running setup.py. So there is no package metadata.

docs/conf.py

@@ -13,7 +13,6 @@
 
 import datetime
 import os
-import pkg_resources
 import sys
 import time
 
@@ -56,17 +55,11 @@ copyright = u'2012-{0}'.format(BUILD_DATE.year)
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
-try:
-    release = pkg_resources.get_distribution('Flask-DebugToolbar').version
-except pkg_resources.DistributionNotFound:
-    print('Flask-DebugToolbar must be installed to build the documentation.')
-    print('Install from source using `pip install -e .` in a virtualenv.')
-    sys.exit(1)
-
-if 'dev' in release:
-    release = ''.join(release.partition('dev')[:2])
-
-version = '.'.join(release.split('.')[:2])
+#
+# The short X.Y version.
+version = '0.10'
+# The full version, including alpha/beta/rc tags.
+release = '0.10.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.