Change 'sort uniq ..' to 'sort(uniq ...)' to avoid newer perls interpret uniq as sortsub
Add 'use experimental smartmatch' for perl 5.18+
Avoid another perl warning
Release v0.20
Update schema/metadata
dist: Use DZP::Rinci::Wrap to test embedding wrapper code
Release v0.21
dist: Replace MANIFEST.SKIP with DZP::PruneFiles