Nominate Keith Smith as a Fabric maintainer

I'd like to nominate Keith to become a Fabric Maintainer.
He's been doing a great job of reviews on fabric-ca
especially, and has really helped us in the push to
fabric,v1.0.0-alpha.

Change-Id: I469f3ab09681053a21eeb468e7e03fbc6c23b50a
Signed-off-by: Christopher Ferris <chrisfer@us.ibm.com>

docs/source/MAINTAINERS.rst

@@ -20,6 +20,8 @@ Maintainers
 +---------------------------+---------------------+------------------+----------------+--------------------------------+
 | Jonathan Levi             | JonathanLevi        | JonathanLevi     | JonathanLevi   | jonathan@hacera.com            |
 +---------------------------+---------------------+------------------+----------------+--------------------------------+
+| Keith Smith               | smithbk             | smithbk          | smithbk        | bksmith@us.ibm.com             |
++---------------------------+---------------------+------------------+----------------+--------------------------------+
 | Kostas Christidis         | kchristidis         | kchristidis      | kostas         | kostas@gmail.com               |
 +---------------------------+---------------------+------------------+----------------+--------------------------------+
 | Sheehan Anderson          | sheehan             | srderson         | sheehan        | sranderson@gmail.com           |