Add `vfile-reporter-position` to list of reporters
Add `vfile-reporter-position` to list of reporters

Closes GH-48.

Reviewed-by: Christian Murphy <87443399f33738b7ca84788ff25901f64eee28bb@gmail.com>
Reviewed-by: Titus Wormer <5a19dbfdb793ef6d212461b3c03b23ad19ae3ed1@gmail.com>
wooorm/vfile,vfile/vfile