Add 3rd party Magik grammar to Supported Languages (#4266)

Author: sebastiaanspeck

CHANGES.md

@@ -4,6 +4,7 @@ New Grammars:
 
 - added 3rd party Aiken grammar to SUPPORTED_LANGUAGES [Josh Marchand][]
 - added 3rd party VoltScript grammar to SUPPORTED_LANGUAGES [Chester Moses][]
+- added 3rd party Magik grammar to SUPPORTED_LANGUAGES [Sebastiaan Speck][]
 - added 3rd party Gleam grammar to SUPPORTED_LANGUAGES [Filip Hoffmann][]
 
 Core Grammars:
@@ -29,6 +30,7 @@ CONTRIBUTORS
 [Antoine Musso]: https://github.com/hashar
 [Chester Moses]: https://github.com/Chester-Moses-HCL
 [Adam Lui]: https://github.com/adamlui
+[Sebastiaan Speck]: https://github.com/sebastiaanspeck
 [Filip Hoffmann]: https://github.com/folospior
 
 

SUPPORTED_LANGUAGES.md

@@ -136,6 +136,7 @@ The table below shows the full list of languages (and corresponding classes/alia
 | Lua                     | lua, pluto             |         |
 | Luau                    | luau                   | [highlightjs-luau](https://github.com/highlightjs/highlightjs-luau) |
 | Macaulay2               | macaulay2              | [highlightjs-macaulay2](https://github.com/d-torrance/highlightjs-macaulay2) |
+| Magik                   | magik                  | [highlightjs-magik](https://github.com/sebastiaanspeck/highlightjs-magik) |
 | Makefile                | makefile, mk, mak, make |        |
 | Markdown                | markdown, md, mkdown, mkd |      |
 | Mathematica             | mathematica, mma, wl   |         |