Update maintainer email address (#433)

Signed-off-by: Mark S. Lewis <Mark.S.Lewis@outlook.com>

MAINTAINERS.md

@@ -1,22 +1,21 @@
-Maintainers
-===========
+# Maintainers
 
 **Active maintainers**
 
-| Name            | GitHub                             | Chat            | email
-|-----------------|------------------------------------|-----------------|-------
-| Matthew B White | [mbwhite][mbwhite]                 | mbwhite         | <whitemat@uk.ibm.com>
-| Mark Lewis      | [bestbeforetoday][bestbeforetoday] | bestbeforetoday | <mark_lewis@uk.ibm.com>
+| Name            | GitHub                             | Chat            | email                    |
+| --------------- | ---------------------------------- | --------------- | ------------------------ |
+| Matthew B White | [mbwhite][mbwhite]                 | mbwhite         | <whitemat@uk.ibm.com>    |
+| Mark Lewis      | [bestbeforetoday][bestbeforetoday] | bestbeforetoday | Mark.S.Lewis@outlook.com |
 
 **Emeritus maintainers**
 
-| Name          | GitHub                     | Chat         | email
-|---------------|----------------------------|--------------|-------
-| James Taylor  | [jt-nti][jt-nti]           | jtonline     | <jamest@uk.ibm.com>
-| Andrew Hurt   | [awjh-ibm][awjh-ibm]       | awjh-ibm     | <andrew.hurt1@ibm.com>
-| Bret Harrison | [harrisob][harrisob]       | bretharrison | <beharrison@nc.rr.com>
-| Chaoyi Zhao   | [zhaochy1990][zhaochy1990] | zhaochy      | <zhaochy_2015@hotmail.com>
-| David Kelsey  | [davidkel][davidkel]       | davidkel     | <d_kelsey@uk.ibm.com>
+| Name          | GitHub                     | Chat         | email                      |
+| ------------- | -------------------------- | ------------ | -------------------------- |
+| James Taylor  | [jt-nti][jt-nti]           | jtonline     | <jamest@uk.ibm.com>        |
+| Andrew Hurt   | [awjh-ibm][awjh-ibm]       | awjh-ibm     | <andrew.hurt1@ibm.com>     |
+| Bret Harrison | [harrisob][harrisob]       | bretharrison | <beharrison@nc.rr.com>     |
+| Chaoyi Zhao   | [zhaochy1990][zhaochy1990] | zhaochy      | <zhaochy_2015@hotmail.com> |
+| David Kelsey  | [davidkel][davidkel]       | davidkel     | <d_kelsey@uk.ibm.com>      |
 
 Also: Please see the [Release Manager section](https://github.com/hyperledger/fabric/blob/main/MAINTAINERS.md)
 
@@ -28,3 +27,4 @@ Also: Please see the [Release Manager section](https://github.com/hyperledger/fa
 [davidkel]: https://github.com/davidkel
 [mbwhite]: https://github.com/mbwhite
 [jt-nti]: https://github.com/jt-nti
+[bestbeforetoday]: https://github.com/bestbeforetoday