Fix path so dependencies can be found on RTD.

docs/conf.py

@@ -15,13 +15,14 @@
 import sys
 import os
 from mock import Mock as MagicMock
-from plaso import dependencies
 
 # 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.
 sys.path.insert(0, os.path.abspath('..'))
 
+from plaso import dependencies
+
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.