Merge branch 'ab/newhash-is-sha256'

Documentation update. * ab/newhash-is-sha256: doc hash-function-transition: pick SHA-256 as NewHash doc hash-function-transition: note the lack of a changelog

Junio C Hamano committed Aug 20, 2018 at 11:33 UTC 34f229790dcc7c7dc61bc37532f88fca39e36de2

No changes.