message: [pdsl_core] Add derive for Encode and Decode for storage::Value
diff: @@ -6,6 +6,8 @@ use crate::{
  },
  };
  +use parity_codec_derive::{Encode, Decode};
  +
  // Missing traits:
  //
  // - DerefMut
  @@ -25,7 +27,7 @@ use crate::{
  /// For assigning new values or mutating the value inside of it either use
  /// [`set`](struct.Value.html#method.set) or
  /// [`mutate_with`](struct.Value.html#method.mutate_with).
  -#[derive(Debug)]
  +#[derive(Debug, Encode, Decode)]
  pub struct Value<T> {
  /// The cell of the storage value.
  cell: SyncCell<T>,
  