chore(package): update @babel/preset-flow to version 7.0.0-rc.4

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "@babel/plugin-transform-async-to-generator": "7.0.0-rc.3",
     "@babel/polyfill": "7.0.0-rc.4",
     "@babel/preset-env": "7.0.0-rc.3",
-    "@babel/preset-flow": "7.0.0-rc.1",
+    "@babel/preset-flow": "7.0.0-rc.4",
     "@commitlint/cli": "7.0.0",
     "@commitlint/config-angular": "7.0.1",
     "@commitlint/config-conventional": "7.0.1",