Fix RST syntax errors/warnings in README.rst

The errors were causing the list in the README to show up unformatted on
github.

README.rst:8: (ERROR/3) Unexpected indentation.
README.rst:9: (WARNING/2) Block quote ends without a blank line;
README.rst:17: (WARNING/2) Definition list ends without a blank line;

Change-Id: Ifdae966f44f582676b428d49497bb0212fad3e03