Update MAINTAINERS (#52)

Update CODEOWNERS to a pointer

Signed-off-by: Ry Jones <ry@linux.com>

Author: ryjones

CODEOWNERS

@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Fabric SDK Java Maintainers
-*	@andrew-coleman @bestbeforetoday @cr22rc @mastersingh24
+*       @hyperledger/fabric-sdk-java-maintainers

MAINTAINERS.md

@@ -1,21 +1,27 @@
-## Maintainers
+Maintainers
+===========
 
-### Active Maintainers
-| Name          | GitHub       | email |
-|---|---|---|
-| Rick Rineholt | cr22rc        | cr22rc@gmail.com       |
-| Gari Singh    | mastersingh24 | gari.r.singh@gmail.com |
-| Andrew Coleman| andrew-coleman | andrew_coleman@uk.ibm.com |
-| Mark Lewis    | bestbeforetoday| Mark.S.Lewis@outlook.com  |
+**Active Maintainers**
+
+| Name | GitHub | Chat | email
+|------|--------|------|----------------------
+| Andrew Coleman | [andrew-coleman][andrew-coleman] | andrew-coleman | andrew_coleman@uk.ibm.com |
+| Mark Lewis | [bestbeforetoday][bestbeforetoday] | bestbeforetoday | Mark.S.Lewis@outlook.com |
+| Gari Singh | [mastersingh24][mastersingh24] | mastersingh24 | <gari.r.singh@gmail.com>
 
+**Retired Maintainers**
 
-### Retired Maintainers
 | Name | GitHub | email |
 |---|---|---|
+| Rick Rineholt | cr22rc | cr22rc@gmail.com |
 | Jim Zhang | jimthematrix | jim_the_matrix@hotmail.com |
 | Muhammad Altaf | malik-altaf | muhammada@fast.au.fujitsu.com |
 | Pardha Vishnumolakala| psaradhi | psaradhi@gmail.com |
 | Satheesh Kathamuthu | xspeedcruiser | satheesh.ceg@gmail.com |
 
 <a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.
 s
+
+[andrew-coleman]: https://github.com/andrew-coleman
+[bestbeforetoday]: https://github.com/bestbeforetoday
+[mastersingh24]: https://github.com/mastersingh24