The type of the systemError parameter is wrongly set to String. As is it accessed as an object in [line 24](https://github.com/bitinn/node-fetch/blob/master/src/fetch-error.js#L24) it should be set to Object. Related PR: https://github.com/bitinn/node-fetch/pull/696
The type of the systemError parameter is wrongly set to String. As is it accessed as an object in line 24 it should be set to Object.
Related PR: #696