Log Message:
py-docx: updated to 0.8.7

0.8.7:
- Add _Row.height_rule
- Add _Row.height
- Add _Cell.vertical_alignment
- Fix 455: increment next_id, don't fill gaps
- Add 375: import docx failure on --OO optimization
- Add 254: remove default zoom percentage
- Add 266: miscellaneous documentation fixes
- Add 175: refine MANIFEST.ini
- Add 168: Unicode error on core-props in Python 2