Ensure xpath subpackage is installed properly

Author: kata198

setup.py

@@ -43,7 +43,7 @@
 
     setup(name='AdvancedHTMLParser',
             version='9.0.0',
-            packages=['AdvancedHTMLParser'],
+            packages=['AdvancedHTMLParser', 'AdvancedHTMLParser.xpath'],
             scripts=['formatHTML'],
             author='Tim Savannah',
             author_email='[email protected]',