Revert "add allow host"
This reverts commit d3503d9f because it raises Error: Unknown option: .devServer. Check out https://babeljs.io/docs/en/babel-core/#options for more information about options.
This reverts commit d3503d9f because it raises Error: Unknown option: .devServer. Check out https://babeljs.io/docs/en/babel-core/#options for more information about options.