What's changed

New: kaml now supports aliases and anchors
New: kaml now supports merging aliases into a map
New: kaml now supports Docker Compose-style extensions

This allows users to define values used in multiple places once, and reference them throughout their document, for example:
```
.build: &build Build tasks
.test: &test Test tasks

tasks:
  build-app:
    group: *build
    command: build.sh app

  build-lib:
    group: *build
    command: build.sh lib

  test-app:
    group: *test
    command: test.sh app

  test-lib:
    group: *test
    command: test.sh lib
```
Specify the extension prefix (such as x- or .) by setting extensionDefinitionPrefix when creating an instance of Yaml.

Extensions can only be defined at the top level of a document, and only if the top level element is a map or object. Any key starting with the extension prefix must have an anchor defined and will not be included in the deserialised value.

Upgrading

If you're using Gradle, reference kaml in your dependencies block like this:

implementation("com.charleskorn.kaml:kaml:0.8.0")

For other tools, refer to the Maven Central release page for more information.