chore(deps): update babel monorepo to v7.0.0-beta.54 (#350)

Author: renovate[bot]

package.json

@@ -36,10 +36,10 @@
   },
   "devDependencies": {
     "@babel/cli": "7.0.0-beta.53",
-    "@babel/core": "7.0.0-beta.53",
-    "@babel/plugin-external-helpers": "7.0.0-beta.53",
-    "@babel/preset-env": "7.0.0-beta.53",
-    "@babel/preset-typescript": "7.0.0-beta.53",
+    "@babel/core": "7.0.0-beta.54",
+    "@babel/plugin-external-helpers": "7.0.0-beta.54",
+    "@babel/preset-env": "7.0.0-beta.54",
+    "@babel/preset-typescript": "7.0.0-beta.54",
     "babel-eslint": "8.2.6",
     "babel-plugin-add-module-exports": "0.3.2",
     "babel-plugin-dev-expression": "0.2.1",