Enable some features for the playground #421
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This will enable some features (`arc_lock`, `serde`, and `deadlock_detection`) on the playground (https://play.rust-lang.org). Feature list was copied from `package.metadata.docs.rs`, feel free to change if it isn't right. See rust-lang/rust-playground#192 for more info. Many other popular crates have done a similar thing ([serde](https://github.com/serde-rs/serde/blob/44613c7d0190dbb5ecd2d5ec19c636f45b7488cc/serde/Cargo.toml#L26-L27), [tokio](https://github.com/tokio-rs/tokio/blob/7a30504fd423aa782239ead92f3afa3474f8037c/tokio/Cargo.toml#L165-L166), etc).
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This will enable some features (
arc_lock,serde, anddeadlock_detection) on the playground (https://play.rust-lang.org). Feature list was copied frompackage.metadata.docs.rs, feel free to change if it isn't right.See rust-lang/rust-playground#192 for more info.
Many other popular crates have done a similar thing (serde, tokio, etc).