Upgrade to latest babel and related packages (#1669)

* `@babel/cli`: 7.0.0 → 7.2.3
* `@babel/core`: 7.0.0 → 7.3.4
* `@babel/polyfill`: 7.0.0 → 7.2.5
* `@babel/preset-env`: 7.3.1 → 7.3.4
* `babel-eslint`: 10.0.0 → 10.0.1
* `babel-loader`: 8.0.0 → 8.0.5

Author: outoftime

package.json

@@ -277,16 +277,16 @@
     "analyze-bundle": "gulp js --production && source-map-explorer ./dist/application.js"
   },
   "devDependencies": {
-    "@babel/cli": "^7.0.0",
-    "@babel/core": "^7.0.0",
+    "@babel/cli": "^7.2.3",
+    "@babel/core": "^7.3.4",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
-    "@babel/polyfill": "^7.0.0",
-    "@babel/preset-env": "^7.3.1",
+    "@babel/polyfill": "^7.2.5",
+    "@babel/preset-env": "^7.3.4",
     "@babel/preset-react": "^7.0.0",
     "@redux-saga/testing-utils": "^1.0.1",
     "almost-equal": "^1.1.0",
-    "babel-eslint": "^10.0.0",
-    "babel-loader": "^8.0.0",
+    "babel-eslint": "^10.0.1",
+    "babel-loader": "^8.0.5",
     "bower": "^1.7.9",
     "brfs": "^2.0.0",
     "browser-sync": "^2.14.3",