Fix cargo publish

Author: tmandry

trait-variant/README.md

@@ -0,0 +1 @@
+../README.md

trait-variant/src/lib.rs

@@ -6,7 +6,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![doc = include_str!("../../README.md")]
+#![doc = include_str!("../README.md")]
 
 mod transformer;
 mod variant;