- Vendor in hex_core at v0.6.8
- Rename checksum to inner_checksum and deprecate in favor of new outer_checksum key/val
- Change warn_vsn_once/0 to warn_vsn_once/1 so we can give a proper error message and
take appropriate action.
- Update rebar.lock to 1.2.0 format with continued support third-party
that still may make use of inner checksum via continued persistence of
inner checksums.
- Changed app info tuple (package representation) to support inner and
outer hashes for backwards compat support (see above)