remove Error::description from errors

Author: seanmonstar

src/util/mod.rs

@@ -43,11 +43,7 @@ macro_rules! error_type {
             }
         }
 
-        impl ::std::error::Error for $name {
-            fn description(&self) -> &str {
-                stringify!($name)
-            }
-        }
+        impl ::std::error::Error for $name {}
     };
 }