[REEF-1790] Update website with committer information

Add Doug Service to the list of Apache committers on the the REEF website as per the instructions on the REEF website.

JIRA:
   [REEF-1790](https://issues.apache.org/jira/browse/REEF-1790)

Pull Request:
   Closes #1300
diff --git a/website/src/site/apt/team.apt b/website/src/site/apt/team.apt
index 5528d2e..95af00c 100644
--- a/website/src/site/apt/team.apt
+++ b/website/src/site/apt/team.apt
@@ -95,3 +95,5 @@
 *------------*--------------------------*---------------------------*
     ssd     |     Sergey Dudoladov     | Technische Universität Berlin |
 *------------*--------------------------*---------------------------*
+ dougservice|      Doug Service        |         Microsoft          |
+*------------*--------------------------*---------------------------*