Bump version to 0.2.22
Bump version to 0.2.22

canndrew/rust-crypto,andreasots/rust-crypto,mseri/rust-crypto,nmathewson/rust-crypto,DaGenix/rust-crypto,PeterReid/rust-crypto,tempbottle/rust-crypto,andreasots/rust-crypto,tempbottle/rust-crypto,thinkingfish/rust-crypto,PeterReid/rust-crypto,thinkingfish/rust-crypto,canndrew/rust-crypto,mseri/rust-crypto,nmathewson/rust-crypto,DaGenix/rust-crypto