switch back to released version of bytes

Merge nix-rust#844

844: Bump version to 0.10.0 r=asomers a=asomers

fork project

Merge nix-rust#705

705: Release 0.9.0 r=asomers

Auto merge of nix-rust#546 - kamalmarhubi:release-0.8.0, r=fiveop

Release v0.8.0

closes nix-rust#519

Release v0.7.0

Bump to v0.6.0

Bump version to 0.5.0

Bump version to v0.4.2

Bump version to v0.3.9