v0.21.1

Changelog

7a1f6af Add output flag to destroy and preview commands
0c52068 Adds more server-side flags to preview command
4495756 Fixes namespace calculation for cluster-scoped resources
a22d0d3 Moves destroyer Initialize() to immediately before Run()
d090658 No prune for namespaces that contain current objects
21dbfee Pin to kyaml v0.9.4
75f251e Verifies interfaces Provider and Manifest
4cda17f add the new lifecycle annotationfor deletion
4983152 split inventory and resources in the apply interface
d75850b update kubectl to 1.18.10