GDScript supported but not listed as such

[menip]

Describe the error
GDScript support was added by #1036. However, it is not shown in the List of supported languages and lexers.

Affected document
https://github.com/rouge-ruby/rouge/wiki/List-of-supported-languages-and-lexers

Additional context
GDScript correctly formats on Gitlab, despite not being listed in list of supported languages.

[stale]

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