extend 1.2.0

Create extensions for types you don't own with extension traits but without the boilerplate.
Documentation
[advisories]
vulnerability = "deny"
unmaintained = "warn"
notice = "warn"
ignore = []

[licenses]
unlicensed = "warn"
allow = []
deny = []
copyleft = "warn"
allow-osi-fsf-free = "either"
confidence-threshold = 0.8

[bans]
multiple-versions = "deny"
highlight = "all"
skip-tree = []

[sources]
unknown-registry = "warn"
unknown-git = "warn"
allow-git = []