Use EncodeLike for storages traits (#3676)

* impl

* patch

* lock

* some refactor

* some avoided copy

* new api without ref for doublemap

* fix

* version bump

* fix

* point to incoming release

* use codec latest

* bumpd impl version

* fix unused

* fix

* Update srml/support/src/storage/mod.rs

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/srml/authority-discovery/src/lib.rs

@@ -29,13 +29,13 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 use app_crypto::RuntimeAppPublic;
-use codec::{Decode, Encode};
+use codec::FullCodec;
 use rstd::prelude::*;
 use support::{decl_module, decl_storage};
 
 /// The module's config trait.
 pub trait Trait: system::Trait + session::Trait {
-	type AuthorityId: RuntimeAppPublic + Default + Decode + Encode + PartialEq;
+	type AuthorityId: RuntimeAppPublic + Default + FullCodec + PartialEq;
 }
 
 decl_storage! {
@@ -102,7 +102,7 @@ impl<T: Trait> Module<T> {
 	fn initialize_keys(keys: &[T::AuthorityId]) {
 		if !keys.is_empty() {
 			assert!(Keys::<T>::get().is_empty(), "Keys are already initialized!");
-			Keys::<T>::put_ref(keys);
+			Keys::<T>::put(keys);
 		}
 	}
 }