v0.1.1: :memo: update readme

Initial release of vetting. This package contains the first, simple test for transiting signals; a simple centroid test which will tell the user if there is a significant offset during transit for input transiting signals. The centroid test takes in a lightkurve.TargetPixelFile object, or a list of lightkurve.TargetPixelFile objects of a single target and performs a simple centroid test, returning a statistical test to the user.