Add upgrade message.

Author: Thom1729

messages/2.4.0.md

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+v2.4.0 (2020-07-13)
+-------------------
+
+# JS Custom now supports TypeScript!
+
+TypeScript support is currently beta-quality, meaning that it should work well for most people but that I expect there to be bugs. If you find a bug, please help out JS Custom by reporting it on the issue tracker at https://github.com/Thom1729/Sublime-JS-Custom/issues.
+
+Known issues at present:
+
+- Type arguments in method calls and template strings are not implemented.
+- Arrow function type parameters are not implemented.
+- Arrow function detection is iffy.
+- TypeScript 4.0 features are not yet implemented.
+- Some features like the built-in `toggle_comment` command do not work if you specify a custom scope, including `source.ts`.
+
+# The next major release will require Sublime 4 (TODO: fix wording)
+
+Sublime Text 4 offers major improvements to the syntax highlighting engine that will allow JS Custom to provide more accurate highlighting with fewer corner cases. JS Custom version 3.0 will require Sublime Text 4 and will not run on older versions. The 2.4 release will still be available for Sublime 3, but it will not receive new feature updates.
+
+The known TypeScript issues listed above will definitely be fixed for 3.0, but they may not be completely fixed in 2.4.
+
+# Other changes.
+
+- When the `rebuild_syntaxes` command deletes a compiled syntax because the configuration doesn't exist anymore, it will find any views using that syntax and reassign them to a default to avoid error messages. This is configurable via the `reassign_when_deleting` setting.
+- When `rebuild_syntaxes` is run with an explicit `versions` argument, it will never delete syntaxes that are not specified in `versions`.