Fix Indentation issues

[lordsherman]

No description provided.

[lordsherman]

This Indentation issue appears to be causing the inability to use the update function on the Items class. There was also a small typo in the items invocation example.

There was a mix of spaces and tabs. The main file seems to use tabs exclusively so I have removed all the spaces.

[Coffee-fueled-deadlines]

Thank you for the work put into it, a few notes:

1. While the majority of the file does, in fact, use tabs: pep standard actually prefers and leans towards spaces. This is a planned fix in the 1.3.1 version.
2. Changes made to the package should be pushed to dev, not to master.

[Coffee-fueled-deadlines]

If you fetch dev, you'll note that I've just converted all tabs to spaces. You're free to merge in the missing ) on the readme file though.