Update to the latest git plus one bonus patch:
    
    - Don't check git submodule in subprocesses.
    - Improve check for "# type: ignore".
    - Add --pdb flag to drop into pdb upon fatal error.
    - Don't report internal error when using a name that could not be imported.
    - Write type-checking errors to stdout. Make usage() more complete.
    - Avoid ever relying on a not-yet-initialized MRO
    - When comparing template to actual arg types, stop at shortest.
    - Be more clever about finding a Python 2 interpreter
    - Basic support for partial 'None' types
    - Handle multiple None initializers
    - Remove redundant annotations
    - Partial type improvements
    - Allow assignments to function definitions
    - Document --pdb option.
    - Look for the keyword type in the right place.