Update docs version number (#274)

* update version number

* get version dynamically

Author: mayantaylor

docs/conf.py

@@ -55,11 +55,12 @@
 # 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.
-#
+
+from charm4py import charm4py_version
 # The short X.Y version.
-version = '1.0'
+version = charm4py_version
 # The full version, including alpha/beta/rc tags.
-release = '1.0.0'
+release = charm4py_version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.