chore(release): 0.20.4 [skip ci]

## [0.20.4](https://github.com/saltstack-formulas/rabbitmq-formula/compare/v0.20.3...v0.20.4) (2021-04-12)

### Bug Fixes

* **latest.sls:** change apt repository following bintray shutdown ([ac16a5f3](https://github.com/saltstack-formulas/rabbitmq-formula/commit/ac16a5f3e08f539d944ea5ecf3de523a5c796301))

### Continuous Integration

* **gemfile+lock:** use `ssf` customised `kitchen-docker` repo [skip ci] ([c456f532](https://github.com/saltstack-formulas/rabbitmq-formula/commit/c456f53235f12bfa7698b4462e6ddc39e79e3c1e))
* **kitchen+ci:** use latest pre-salted images (after CVE) [skip ci] ([9a6f0c6e](https://github.com/saltstack-formulas/rabbitmq-formula/commit/9a6f0c6e5bcd8bf0b13b8b02f256a8f1e763109e))
* **kitchen+gitlab-ci:** use latest pre-salted images [skip ci] ([ebb55f3a](https://github.com/saltstack-formulas/rabbitmq-formula/commit/ebb55f3aec4dedc56315e83f707a3144700bd3d1))
* **pre-commit:** update hook for `rubocop` [skip ci] ([04ddd762](https://github.com/saltstack-formulas/rabbitmq-formula/commit/04ddd762bc7e17820401694f0605d1238e7753a7))

### Tests

* standardise use of `share` suite & `_mapdata` state [skip ci] ([2d827636](https://github.com/saltstack-formulas/rabbitmq-formula/commit/2d8276361caf62a89a4e40e18de8e0f783a6d917))
* **_mapdata:** add verification files for Fedora 32+33 & Ubuntu 20.04 ([f0b0182b](https://github.com/saltstack-formulas/rabbitmq-formula/commit/f0b0182b2697a08ab4928037a3fcb1c8be40cf17))
* **share:** standardise with latest changes [skip ci] ([133ba1de](https://github.com/saltstack-formulas/rabbitmq-formula/commit/133ba1dee12c1d71ca12e3f7c6c4b6285a8fc07b))