Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  5f143709a3aa9d25b54608ec82e6409c1970719b

pre-commit hook that checks for whitespace

Avoids red in gerrit, and nit-picking reviews :-)
The script tells you how to install itself.

Change-Id: Ib995f2c663e4ec65eeef114c1a565ce4b70a2f2c