Update dependency babel-loader to v8.0.4

Author: renovate-bot

package-lock.json

@@ -38,7 +38,7 @@
     "@babel/register": "7.0.0",
     "babel-core": "7.0.0-bridge.0",
     "babel-jest": "23.4.0",
-    "babel-loader": "8.0.0-beta.4",
+    "babel-loader": "8.0.4",
     "babel-plugin-graphql-tag": "1.6.0",
     "babel-plugin-module-resolver": "3.1.1",
     "eslint": "4.19.1",