Nominate Matthew Sykes as Fabric maintainer

I would like to nominate Matthew Sykes as a Fabric maintainer.
Matt has been a significant contributer to Fabric in the areas
of chaincode, build, test, and overall code hygiene. Beyond
code, Matt has helped the Fabric team adopt new agile and test
approaches. Matt has been a consistent code reviewer and is often
the go-to reviewer for advanced golang questions. In fact,
Matt has easily been the most prolific contributor and the most
prolific reviewer of any non-maintainer this year.

FAB-11704 #done

Change-Id: Id589e60a466f3cf84f084cb0c859e946295b6cf9
Signed-off-by: David Enyeart <enyeart@us.ibm.com>

Author: denyeart

docs/source/MAINTAINERS.rst

@@ -28,6 +28,8 @@ Maintainers
 +---------------------------+---------------------+------------------+----------------+-------------------------------------+
 | Manish Sethi              | manish-sethi        | manish-sethi     | manish-sethi   | manish.sethi@gmail.com              |
 +---------------------------+---------------------+------------------+----------------+-------------------------------------+
+| Matthew Sykes             | sykesm              | sykesm           | sykesm         | sykesmat@us.ibm.com                 |
++---------------------------+---------------------+------------------+----------------+-------------------------------------+
 | Srinivasan Muralidharan   | muralisr            | muralisrini      | muralisr       | srinivasan.muralidharan99@gmail.com |
 +---------------------------+---------------------+------------------+----------------+-------------------------------------+
 | Yacov Manevich            | yacovm              | yacovm           | yacovm         | yacovm@il.ibm.com                   |