Log Message:
Update py-vobject to 0.9.5.

0.9.5
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* Make ics_diff.py work with Python 3
* Huge changes to text encoding for Python 2/3 compatibility
* Autogenerate DTSTAMP if not provided
* Fix getrruleset() for Python 3 and in the case that addRDate=True
* Update vCard property validation to match specifications
* Handle offset-naive and offset-aware datetimes in recurrence rules
* Improved documentation for multi-value properties