chore(release): 0.20.0 [skip ci]

# [0.20.0](https://github.com/saltstack-formulas/systemd-formula/compare/v0.19.1...v0.20.0) (2021-10-08)

### Continuous Integration

* **3003.1:** update inc. AlmaLinux, Rocky & `rst-lint` [skip ci] ([73c1b610](https://github.com/saltstack-formulas/systemd-formula/commit/73c1b610f3dd430bd634febc8296b6a654967d6e))
* **gemfile+lock:** use `ssf` customised `inspec` repo [skip ci] ([b9fc05c0](https://github.com/saltstack-formulas/systemd-formula/commit/b9fc05c03322e4ec4f9c91ed67e999be2052eaf4))
* **kitchen:** move `provisioner` block & update `run_command` [skip ci] ([04bb3110](https://github.com/saltstack-formulas/systemd-formula/commit/04bb311059785da05001d80aac577a9cbfcd30be))
* **kitchen+ci:** update with latest `3003.2` pre-salted images [skip ci] ([69f215f0](https://github.com/saltstack-formulas/systemd-formula/commit/69f215f0b8b11b576b6760e00a19783e48e7d814))
* **kitchen+ci:** update with latest CVE pre-salted images [skip ci] ([a7450883](https://github.com/saltstack-formulas/systemd-formula/commit/a74508838fc4158c501e2092600fd475963efafd))
* add Debian 11 Bullseye & update `yamllint` configuration [skip ci] ([9e958b0a](https://github.com/saltstack-formulas/systemd-formula/commit/9e958b0aed9fac78b7a6eaede726411d80fdf32f))

### Features

* **centos-stream:** add Centos Stream support ([cdddd55e](https://github.com/saltstack-formulas/systemd-formula/commit/cdddd55e4921d0e2a1d1cf3afaf4211ca8cae927))
* **osfingermap:** add Debian 11 support (w/o `wait_online`) [skip ci] ([d24fd3f6](https://github.com/saltstack-formulas/systemd-formula/commit/d24fd3f606e8de56af1a445e2685236c3cce57b3))