Update babel monorepo

Author: renovate-bot

package.json

@@ -17,9 +17,9 @@
     "compile:prod:js": "yarn compile:dev:js --environment BABEL_ENV:production"
   },
   "devDependencies": {
-    "@babel/core": "7.4.3",
-    "@babel/plugin-proposal-class-properties": "7.4.0",
-    "@babel/preset-env": "7.4.3",
+    "@babel/core": "7.6.2",
+    "@babel/plugin-proposal-class-properties": "7.5.5",
+    "@babel/preset-env": "7.6.2",
     "babel-minify": "0.5.0",
     "cssnano": "4.1.10",
     "npm-run-all": "4.1.5",