chore(deps): update dependency flow-copy-source to v2

Author: renovate-bot

package.json

@@ -92,7 +92,7 @@
     "eslint-plugin-flowtype": "^2.30.0",
     "eslint-watch": "^3.0.0",
     "flow-bin": "^0.90.0",
-    "flow-copy-source": "^1.2.1",
+    "flow-copy-source": "^2.0.0",
     "flow-watch": "^1.1.0",
     "husky": "^0.14.3",
     "istanbul": "^0.4.5",