Do not implement is_human_readable

This is useless to implement in actual deserializers, because serde internal deserializers
(used to implement flatten of tagged enums) does not inherit that values. The right way
to change it is to use serde_test::Compact and serde_test::Readable adapters which would
transform every deserializer that can come from actual deserializers

Author: Mingun

src/de/map.rs

@@ -597,11 +597,6 @@ where
             filter,
         })
     }
-
-    #[inline]
-    fn is_human_readable(&self) -> bool {
-        self.map.de.is_human_readable()
-    }
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -914,11 +909,6 @@ where
         let text = self.read_string()?;
         SimpleTypeDeserializer::from_text(text).deserialize_seq(visitor)
     }
-
-    #[inline]
-    fn is_human_readable(&self) -> bool {
-        self.map.de.is_human_readable()
-    }
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////