substrateのtutorial Kitties chain でuse of undeclared crate or module `sp_io`が出る
cargo build -p pallet-kittiesでエラー
error[E0433]: failed to resolve: use of undeclared crate or module `sp_io`
解決方法
[dependencies] ~ <- ここにコピー [dev-dependencies] sp-io = ~ <- これを