updated changelog w/ summary for
-2016-06-19: v0.0.3
+2017-xx-xx: WIP
+ bumped protos to Mesos 1.2.x (v1 API only), with operator API support
+ api/v1/lib/... API refactoring (client, encoding, httpcli, recordio)
+ api/v1/cmd/... new and updated examples (see msh)
+ bumped gogo/protobuf dependency
+
+2017-06-19: v0.0.3
Initial support for Mesos v1 HTTP API
Mesos 1.1.1 protos (v1 API only)
Shuffled packaging to accommodate both Mesos v0 and v1 APIs
