README.rst: Remove space before bullets

Causes rendering as block quote.

See:

- http://docutils.sourceforge.net/docs/user/rst/quickref.html#bullet-lists
- http://docutils.sourceforge.net/docs/user/rst/quickref.html#block-quotes

Change-Id: I252d3f19286b11403abbe12faaf11db68b175604
Merge "README.rst: Remove space before bullets"