Add BinOp and UnOp to syn::ast::prelude

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/syn/ast.rs

@@ -6,6 +6,8 @@ pub mod prelude {
         AssignStmt, BaseExpr, BaseExprKind, BinExpr, Expr, FunCallExpr, FunExpr, IndexExpr, Stmt,
         UnExpr,
     };
+
+    pub use crate::syn::op::{BinOp, UnOp};
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]