fix(fontweight): support undocumented font weight value

Author: kwonoj

src/types.rs

@@ -11,6 +11,7 @@ use std::mem;
 pub enum FontWeight {
     Thin = 100,
     ExtraLight = 200,
+    YaheiLight = 290,
     Light = 300,
     SemiLight = 350,
     Regular = 400,