v0.0.7

Features

• Add issue templates (#68) (bdd3c14)
• make projection extension mandatory (#70) (e9d0ec3)
• Support Nix (#67) (a4f765b)
• unit testing with ospec (#76) (5879d84)

Reverts

• reinstate stac_extensions schema definitions (#65) (7418626), closes /github.com/linz/stac/pull/60#discussion_r715257218