Update dependency babel-plugin-flow-react-proptypes to v26

Author: renovate-bot

package-lock.json

@@ -23,7 +23,7 @@
     "babel-core": "6.26.0",
     "babel-eslint": "8.2.2",
     "babel-loader": "6.4.1",
-    "babel-plugin-flow-react-proptypes": "19.1.0",
+    "babel-plugin-flow-react-proptypes": "26.0.0",
     "babel-plugin-transform-flow-strip-types": "6.22.0",
     "babel-plugin-transform-object-rest-spread": "6.26.0",
     "babel-plugin-transform-runtime": "6.23.0",