message: clean up unused dependencies
diff: "@prague/map": "^0.1.0",
  "@prague/merge-tree": "^0.1.0",
  "@prague/runtime-definitions": "^0.1.0",
  - "@prague/services-client": "^0.1.0",
  "@prague/shared-string": "^0.1.0",
  "@prague/stream": "^0.1.0",
  "@prague/utils": "^0.1.0",
  