chore: update changelog

1.8.8 & 1.8.9 change log (#4123)

* docs: add `1.8.8` change log

* docs: add `1.8.9` change log

Bundled output for commit 391a861

Includes transpiled JS/TS, and Typescript declaration files (typings).

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chore: create changelog

chore(flags): require `flarum/core` `^1.8.6` (#4061)

chore: prep 1.8.5 release

chore: prep 1.8.3 release

chore: prep 1.8.2 release

chore: prepare v1.8.1 release

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

Bundled output for commit e5abffc

Includes transpiled JS/TS, and Typescript declaration files (typings).

[skip ci]