Set version in docs automatically from metadata (#1713)

Update sphinx

doc/conf.py

@@ -13,6 +13,7 @@
 
 import sys, os, re
 import os.path
+import importlib
 
 # print "working path is %s" % os.getcwd()
 # sys.path.append("../cadquery")
@@ -66,11 +67,9 @@ copyright = "Parametric Products Intellectual Holdings LLC, All Rights Reserved"
 # 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.
-version = "2.4"
-# The full version, including alpha/beta/rc tags.
-release = "2.4.0"
+
+version = importlib.metadata.version("cadquery")
+release = version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.