Remove uses of pkg_resources

docs/conf.py

@@ -2,7 +2,7 @@ import os
 import sys
 
 import alabaster
-from pkg_resources import get_distribution
+from sigal import __version__
 
 # 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
@@ -39,12 +39,8 @@ copyright = "2012-2020, Simon Conseil"
 # 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.
-#
-# The short X.Y version.
-release = get_distribution("sigal").version
-# for example take major/minor
-version = ".".join(release.split(".")[:2])
-
+release = __version__
+version = __version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.