Update README.md
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Merge branch 'master' of https://github.com/apache/incubator-usergrid
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-usergrid
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-usergrid
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-usergrid