Networks config json does not get included in build output

[mi-xu]

Received an error when attempting to resolve an ethr-did with a network id specified:

const doc = await resolver.resolve('did:ethr:rinkeby:0xf1232f840f3ad7d23fcdaa84d6c66dac24efb198')

    Cannot find module './networks.json' from 'ethr-did-resolver.js'

      200 |   const networks = {
      201 |     mainnet: configureNetwork(conf),
    > 202 |     ...configureNetworks(require('./networks.json')),
          |                                  ^
      203 |     ...configureNetworks(conf.networks)
      204 |   }
      205 |