Inject AuthorDeps standard
Single txns seem to be fine if you have 1-file-per-namespace
Add SHA1 to Changelog section headers
v2.021000

 [00 Minor]
 - Inject Prereqs::AuthorDeps to auto discover develop deps.
 - Add shortend SHA1 to changes headers.

 [Dependencies::Stats]
 - Dependencies changed since 2.020005, see misc/*.deps* for details
 - develop: ↑1
 - runtime: +1 ↑1
post-release cleanup