Bump flow-bin from 0.71.0 to 0.78.0

Bumps [flow-bin](https://github.com/flowtype/flow-bin) from 0.71.0 to 0.78.0.
- [Release notes](https://github.com/flowtype/flow-bin/releases)
- [Commits](flow/flow-bin@v0.71.0...v0.78.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -30,7 +30,7 @@
     "eslint": "^4.2.0",
     "eslint-config-omaha-prime-grade": "^10.0.0",
     "eslint-plugin-compat": "^2.0.1",
-    "flow-bin": "^0.71.0",
+    "flow-bin": "^0.78.0",
     "grunt": "^1.0.0",
     "grunt-benchmark": "^1.0.0",
     "grunt-cli": "^1.0.0",