Add abarth as a Mojo OWNER

I'd like to be able to review CLs like
https://codereview.chromium.org/76353002/ without having to wait for another
reviewer.

NOTRY=true

Review URL: https://codereview.chromium.org/63573008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236010 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236010
[Telemetry] Fail explicitly if running under an old Python version.

This also serves to document the minimum supported Python version.

BUG=

Review URL: https://codereview.chromium.org/65653004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236011 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236011