[feature request] Looking up parent directories for tsconfig files as a default

[quantuminformation]

This would save having to use

      {
        test: /\.ts$/,
        loader: 'awesome-typescript-loader',
        options: { configFileName: '../../tsconfig.json' }
      },

if you have lots of sub dirs that want to use parent configs.

[wclr]

Right it prints [at-loader] Using typescript@2.4.1 from typescript and "tsconfig.json" from ...\current\dir\tsconfig.json. but there is even no such file.