Updated mediawiki/extensions
Project: mediawiki/extensions/MassMessage  0ce0d50f4ac0c07ba2e430c3cf7324a9d924f4a5

Improve markdown and workaround bug 54050

Original Markdown guide suggests using four spaces
for standalone code blocks, not standalone quotes.

Remove word "tags" in angle quotes, it does not
play well with markdown - github renders it as
the HTML tag and automatically closes it.

Change-Id: I31058567cfe9d2cba412d6fc2795f8d7f7f56a0f