Flatten modifiers in C# to improve highlighting

CHANGELOG.md

@@ -9,6 +9,8 @@ Added support for XML.
 Improved syntax highlighting of constructors (i.e. type names when
 values are constructed, such as `Foo {}`).
 
+Improved syntax highlighting for C#.
+
 ## 0.51.1 (released 25th August 2023)
 
 Fixed an issue with GitHub actions that prevented prebuilt binaries

src/parse/tree_sitter_parser.rs

@@ -243,6 +243,7 @@ pub fn from_language(language: guess::Language) -> TreeSitterConfig {
                     "string_literal",
                     "verbatim_string_literal",
                     "character_literal",
+                    "modifier",
                 ]
                 .into_iter()
                 .collect(),