Add Andrew Coleman as a maintainer (#81)

Signed-off-by: Troy Ronda <troy@troyronda.com>

MAINTAINERS.md

@@ -1,17 +1,20 @@
 ## Maintainers
 
 ### Active Maintainers
+
 | Name | GitHub | email |
 |---|---|---|
+| Andrew Coleman | andrew-coleman | andrew_coleman@uk.ibm.com |
 | Aleksandar Likic | alikic | aleksandar.likic@securekey.com |
 | Bob Stasyszyn | bstasyszyn | bob.stasyszyn@securekey.com |
 | Firas.Qutishat | fqutishat | firas.qutishat@securekey.com |
 | Gari Singh | mastersingh24 | gari.r.singh@gmail.com |
 | Troy Ronda | troyronda | troy@troyronda.com |
 
 ### Retired Maintainers
+
 | Name | GitHub | email |
-|---|---|---|---|
+|---|---|---|
 | Jim Zhang | jimthematrix | jim_the_matrix@hotmail.com |
 
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