Update eax/src/lib.rs

Author: baloo

eax/src/lib.rs

@@ -154,6 +154,7 @@ pub type Nonce<NonceSize> = Array<u8, NonceSize>;
 /// EAX tags
 pub type Tag<TagSize> = Array<u8, TagSize>;
 
+# to drop once https://github.com/RustCrypto/traits/pull/1533 releases.
 type OutputSize<T> = <T as OutputSizeUser>::OutputSize;
 
 pub mod online;