Update babel monorepo to v7.5.4 (#100)

Author: renovate[bot]

package-lock.json

@@ -12,8 +12,8 @@
         "commander": "2.20.0"
     },
     "devDependencies": {
-        "@babel/core": "7.5.0",
-        "@babel/preset-env": "7.5.3",
+        "@babel/core": "7.5.4",
+        "@babel/preset-env": "7.5.4",
         "@babel/preset-typescript": "7.3.3",
         "@types/jest": "24.0.15",
         "@types/node": "12.6.1",