update to codec 2.0

[gui1117]

once it is merge I will publish and add tags

[gui1117]

wait it actually some crate doesn't compile:

error[E0603]: module `export` is private
   --> /home/thiolliere/.cargo/registry/src/github.com-1ecc6299db9ec823/criterion-0.3.4/src/connection.rs:201:17
    |
201 | #[derive(Debug, Deserialize)]
    |                 ^^^^^^^^^^^ private module
    |
note: the module `export` is defined here
   --> /home/thiolliere/.cargo/registry/src/github.com-1ecc6299db9ec823/serde-1.0.123/src/lib.rs:275:5
    |
275 | use self::__private as export;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^

I'll fix it tomorrow, (though substrate chain using this branch is passing CI.)

[ordian]

I'll do the publishing shortly.

[ordian]

Published memory-db, trie-bench, reference-trie. I don't think we need to publish test crates.

[gui1117]

great thanks