update tree-sitter version and fix build.rs (Wilfred#7)

* Update Cargo.toml

* Update build.rs

Cargo.toml

@@ -20,7 +20,7 @@ include = [
 path = "bindings/rust/lib.rs"
 
 [dependencies]
-tree-sitter = "0.17"
+tree-sitter = "0.20"
 
 [build-dependencies]
 cc = "1.0"

bindings/rust/build.rs

@@ -1,40 +1,16 @@
 fn main() {
     let src_dir = std::path::Path::new("src");
-
     let mut c_config = cc::Build::new();
     c_config.include(&src_dir);
     c_config
         .flag_if_supported("-Wno-unused-parameter")
         .flag_if_supported("-Wno-unused-but-set-variable")
         .flag_if_supported("-Wno-trigraphs");
     let parser_path = src_dir.join("parser.c");
-    c_config.file(&parser_path);
-
-    // If your language uses an external scanner written in C,
-    // then include this block of code:
-
-    /*
     let scanner_path = src_dir.join("scanner.c");
+    c_config.file(&parser_path);
     c_config.file(&scanner_path);
     println!("cargo:rerun-if-changed={}", scanner_path.to_str().unwrap());
-    */
-
-    c_config.compile("parser");
     println!("cargo:rerun-if-changed={}", parser_path.to_str().unwrap());
-
-    // If your language uses an external scanner written in C++,
-    // then include this block of code:
-
-    /*
-    let mut cpp_config = cc::Build::new();
-    cpp_config.cpp(true);
-    cpp_config.include(&src_dir);
-    cpp_config
-        .flag_if_supported("-Wno-unused-parameter")
-        .flag_if_supported("-Wno-unused-but-set-variable");
-    let scanner_path = src_dir.join("scanner.cc");
-    cpp_config.file(&scanner_path);
-    cpp_config.compile("scanner");
-    println!("cargo:rerun-if-changed={}", scanner_path.to_str().unwrap());
-    */
+    c_config.compile("parser");
 }