Build issue using v 4.0.0 due to dependency on your koa-router fork?
We are still using version 4.0.0 of this package which has a specific commit dependency on your fork of koa-router:

git+https://github.com/aheckmann/koa-router.git#f0c60d374b5903f

This has started breaking in our recent builds.  Is it possible you changed something on your fork that would break this?

When we try and npm install we get a git error:

    npm info git [ 'rev-list', '-n1', 'f0c60d374b5903f' ]
    npm ERR! git rev-list -n1 f0c60d374b5903f: fatal: ambiguous argument 'f0c60d374b5903f': unknown     revision or path not in the working tree.

We can see that commit in github, but it does not seem to appear in any branch?
