[droundy]

Release 0.1.9 with:

• no_std support, with a default std feature and an optional portable-atomic feature (Make the crate no_std, with std as a default feature #16, Split spin_wait into std and no_std versions #18)
• handling of allocation failure and zero-sized types (Handle allocation failure and zero-sized types #17)

Note for users: a crate that already sets default-features = false and runs on a platform with std loses yielding to the OS when a push waits a long time; it should enable the std feature again.

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