Bump flow-copy-source from 1.2.1 to 2.0.9

Bumps [flow-copy-source](https://github.com/Macil/flow-copy-source) from 1.2.1 to 2.0.9.
- [Release notes](https://github.com/Macil/flow-copy-source/releases)
- [Changelog](https://github.com/Macil/flow-copy-source/blob/master/CHANGELOG.md)
- [Commits](Macil/flow-copy-source@v1.2.1...v2.0.9)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -15,7 +15,7 @@
     "babel-register": "^6.26.0",
     "eslint-plugin-flowtype": "^2.39.1",
     "flow-bin": "^0.59.0",
-    "flow-copy-source": "^1.2.1",
+    "flow-copy-source": "^2.0.9",
     "mocha": "^4.0.1",
     "npm-run-all": "^4.1.2",
     "nyc": "^11.3.0",