Pretty print history

[nhunzaker]

I'd love a debug helper that could pretty print what has happened in history. Something nicer than:

console.log('What changed:', )
console.log(this.repo.history.map(action => [action.command.name, JSON.stringify(action.payload || {}).slice(0, 70) ]))

What changed:

    [ [ '$start', '{}' ],
      [ '$addDomain', '{}' ],
      [ '$addDomain', '{}' ],
      [ '$addDomain', '{}' ],
      [ '$addDomain', '{}' ],
      [ '$addDomain', '{}' ],
      [ '$addDomain', '{}' ],
      [ '$addDomain', '{}' ],
      [ '$addDomain', '{"NOTIFICATION_ID":0}' ],
      [ '$reset',
        '{"blocks":[{"id":1,"type":"row","parent":null,"styles":{}},{"id":2,"ty' ],
      [ 'setMessageProperties', '{"senderId":1}' ],
      [ 'focusBlock', '1' ],
      [ 'setRowResize',
        '{"row":{"id":1,"type":"row","parent":null,"styles":{}},"resizeable":tr' ],
      [ 'updateBlock', '{"id":2,"styles":{"columnWidth":"33%"}}' ],
      [ 'updateBlock', '{"id":3,"styles":{"columnWidth":"33%"}}' ],
      [ 'updateBlock', '{"id":4,"styles":{"columnWidth":"33%"}}' ],
      [ 'setRowResize',
        '{"row":{"id":1,"type":"row","parent":null,"styles":{},"attributes":{"r