`PluginOptions` should have optional keys

[kaiyoma]

What package is the bug related to?

typedoc-plugin-markdown

Describe the issue

The keys of the PluginOptions interface are all required currently, which means every user (with a TypeScript config file) must use Partial. It would be more user-friendly (and more accurate) to make all the keys optional. This same issue was just fixed in typedoc too: TypeStrong/typedoc#2901

TypeDoc configuration

No response

Expected behavior

No response

[tgreyuk]

Please try typedoc-plugin-markdown@4.5.1

[kaiyoma]

Fixed! Thanks for the quick fix. 😄