Fix version number of mongo-orchestration
Fix version number of mongo-orchestration

mongo-orchestration 0.4 requires pymongo 3.x, but mongo-connector requests pymongo 2.x.

XDestination/mongo-connector,10gen-labs/mongo-connector,XDestination/mongo-connector,10gen-labs/mongo-connector,agolo/mongo-connector,agolo/mongo-connector,ShaneHarvey/mongo-connector,ShaneHarvey/mongo-connector,mongodb-labs/mongo-connector,mongodb-labs/mongo-connector,sailthru/mongo-connector,sailthru/mongo-connector