Add Andrew Coleman as a maintainer
## 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 |
| Troy Ronda | troyronda | troy@troyronda.com |
### Retired Maintainers
+
| Name | GitHub | email |
-|---|---|---|---|
+|---|---|---|
| Jim Zhang | jimthematrix | jim_the_matrix@hotmail.com |
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