Patch the lisp syntax

[ccqpein]

The potential solution of the issue #2969.

I am not sure if it is the right way to update syntax of bat, and it is my first git patch. Feel free to change anything.

Thanks

[keith-hall]

this looks okay to me, this sublime-syntax doesn't seem to use any more recent features which the syntax highlighting engine syntect doesn't support yet.
In order to get the CI step to pass, you'll need to update the "highlighted file" - see https://github.com/sharkdp/bat/blob/master/doc/assets.md#syntax-tests. I would also recommend including some code in the "source file" which this upgrade solves highlighting for, like you mentioned (defun test () :a-from-b)

[ccqpein]

Sure, let me check the test file.

PS: I think I don't need to add this code snippet as the new test. Because the current test sets already show the issue (except it is -test- rather than the -from-).

[keith-hall]

Thanks for your contribution 🙂

[ccqpein]

@keith-hall no problem. Thanks for your project maintaining too!