Add Andrew Coleman as a maintainer (hyperledger#81)

Signed-off-by: Troy Ronda <[email protected]>

MAINTAINERS.md

@@ -1,17 +1,20 @@
 ## Maintainers
 
 ### Active Maintainers
+
 | Name | GitHub | email |
 |---|---|---|
+| Andrew Coleman | andrew-coleman | [email protected] |
 | Aleksandar Likic | alikic | [email protected] |
 | Bob Stasyszyn | bstasyszyn | [email protected] |
 | Firas.Qutishat | fqutishat | [email protected] |
 | Gari Singh | mastersingh24 | [email protected] |
 | Troy Ronda | troyronda | [email protected] |
 
 ### Retired Maintainers
+
 | Name | GitHub | email |
-|---|---|---|---|
+|---|---|---|
 | Jim Zhang | jimthematrix | [email protected] |
 
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