Update Substrate (#334)

Cargo.dev.toml

auction/src/lib.rs

auction/src/mock.rs

authority/src/lib.rs

authority/src/mock.rs

authority/src/tests.rs

benchmarking/src/lib.rs

benchmarking/src/tests.rs

currencies/README.md

currencies/src/lib.rs

currencies/src/mock.rs

gradually-update/src/lib.rs

gradually-update/src/mock.rs

nft/src/lib.rs

nft/src/mock.rs

nft/src/tests.rs

oracle/src/default_combine_data.rs

oracle/src/lib.rs

oracle/src/mock.rs

rewards/src/lib.rs