Fix root option on glob

[Janpot]

Fixes #37

[coveralls]

Coverage decreased (-3.7%) to 96.3% when pulling 985eddf on Janpot:fix-glob-root-option into 6411ea4 on wearefractal:master.

[Janpot]

ok, bad test + coverage, let me fix this

[coveralls]

Coverage remained the same at 100.0% when pulling c276d5d on Janpot:fix-glob-root-option into 6411ea4 on wearefractal:master.

[coveralls]

Coverage remained the same at 100.0% when pulling f7608bf on Janpot:fix-glob-root-option into 6411ea4 on wearefractal:master.

[yocontra]

rebase?

[coveralls]

Coverage remained the same at 100.0% when pulling de2f38b on Janpot:fix-glob-root-option into 0839bdd on wearefractal:master.

[Janpot]

@contra done

[yocontra]

Needs docs on what the root option does

[Janpot]

@contra It's already documented here: https://github.com/wearefractal/glob-stream#options

This argument is passed directly to node-glob so check there for more options

Which leads to:

root The place where patterns starting with / will be mounted onto. Defaults to path.resolve(options.cwd, "/") (/ on Unix systems, and C:\ or some such on Windows.)

[Janpot]

@contra Can you give some more input on which extra docs you expect for this PR? In my opinion no extra doc is needed as this is only a bugfix on an existing feature.