Add scala maintainer

Add fold for scala val definition to support type class entries

lua/nvim-treesitter/parsers.lua

@@ -391,6 +391,7 @@ list.scala = {
     url = "https://github.com/tree-sitter/tree-sitter-scala",
     files = { "src/parser.c", "src/scanner.c" },
   },
+  maintainers = { "@stevanmilic" },
 }
 
 list.supercollider = {

queries/scala/folds.scm

@@ -4,6 +4,7 @@
  (trait_definition)
  (object_definition)
  (function_definition)
+ (val_definition)
  (import_declaration)
 
  (while_expression)