chore(package): update flow-remove-types to version 2.121.0

Closes #138

Author: greenkeeper[bot]

Diff for: package.json

@@ -104,7 +104,7 @@
     "eslint-plugin-flowtype": "^2.36.0",
     "express": "^4.16.0",
     "flow-bin": "^0.58.0",
-    "flow-remove-types": "^1.2.1",
+    "flow-remove-types": "^2.121.0",
     "generate-release": "^0.14.0",
     "nodemon": "^1.12.1",
     "nsp": "^3.0.0",