v1.9.0 Multiple callout qualifiers

Implements #4.

• mkdocs-callouts now translates multiple callout qualifiers to the correct type, which reverts some changes to how mkdocs-material handles admonitions - without increasing the size of CSS.

This behavior is enabled by default, but can be disabled by setting aliases to false in the plugin configuration:

plugins:
  - search
  - callouts:
      aliases: false

Full Changelog: v1.8.1...v1.9.0