Enable slicing_syntax in rust-crypto-util
Enable slicing_syntax in rust-crypto-util

mseri/rust-crypto,thinkingfish/rust-crypto,exe-dealer/rust-md5,PeterReid/rust-crypto,canndrew/rust-crypto,nmathewson/rust-crypto,vladikoff/rust-crypto,PeterReid/rust-crypto,mseri/rust-crypto,andreasots/rust-crypto,DaGenix/rust-crypto,tempbottle/rust-crypto,thinkingfish/rust-crypto,tempbottle/rust-crypto,andreasots/rust-crypto,DaGenix/rust-crypto,nmathewson/rust-crypto,canndrew/rust-crypto