message: add key to console.log
diff: import { Town } from '../town/_common'
  export function findBuilding (town: Town, key: string) {
  - console.log('Finding a building.')
  + console.log('Finding a building;', key)
  return town.buildings.find(building => building.key === key)
  }
  export function findBuildingIndex (town: Town, key: string) {
  - console.log('Finding index of a building.')
  + console.log('Finding index of a building;', key)
  return town.buildings.findIndex(building => building.key === key)
  }
  