Add rainbows.scm for Koto

Author: irh

languages.toml

@@ -4370,7 +4370,7 @@ formatter = {command = "koto", args = ["--format"]}
 
 [[grammar]]
 name = "koto"
-source = { git = "https://github.com/koto-lang/tree-sitter-koto", rev = "2ffc77c14f0ac1674384ff629bfc207b9c57ed89" }
+source = { git = "https://github.com/koto-lang/tree-sitter-koto", rev = "633744bca404ae4edb961a3c2d7bc947a987afa4" }
 
 [[language]]
 name = "gpr"

runtime/queries/koto/highlights.scm

@@ -105,7 +105,7 @@
   start: (identifier) @function)
 
 (chain
-  lookup: (identifier) @variable.other.member)
+  (lookup (identifier)) @variable.other.member)
 
 (call
   function: (identifier)) @function

runtime/queries/koto/rainbows.scm

@@ -0,0 +1,10 @@
+[
+  (list)
+  (map)
+  (tuple)
+  (args)
+  (call_args)
+  (index)
+] @rainbow.scope
+
+["(" ")" "[" "]" "{" "}" "|"] @rainbow.bracket