Update the sphinx path so that ReadTheDocs builds work.

docs/conf.py

@@ -9,10 +9,10 @@
 # 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
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-#
-# import os
-# import sys
-# sys.path.insert(0, os.path.abspath('.'))
+
+import os
+import sys
+sys.path.insert(0, os.path.abspath('../src'))
 
 
 # -- Project information -----------------------------------------------------