chore(package): update flow-bin to version 0.78.0

Closes #9

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   "devDependencies": {
     "@types/node": "10.3.4",
     "codecov": "^3.0.2",
-    "flow-bin": "^0.75.0",
+    "flow-bin": "^0.78.0",
     "size-limit": "^0.18.0",
     "ts-react-toolbox": "^0.1.10"
   }