Merge nix-rust#1277

1277: Release version 0.18.0 r=asomers a=asomers



Co-authored-by: Alan Somers <asomers@gmail.com>

Release 0.17.0

Merge nix-rust#1162

1162: Release v0.16.0 r=asomers a=asomers



Co-authored-by: Alan Somers <asomers@gmail.com>

Release v0.13.1

Release v0.12.1

Merge nix-rust#1081

1081: Release v0.14.1 r=asomers a=asomers



Co-authored-by: Alan Somers <asomers@gmail.com>

Release v0.11.1

Merge nix-rust#1061

1061: Release v0.14.0 r=asomers a=asomers



Co-authored-by: Alan Somers <asomers@gmail.com>

Merge nix-rust#1014

1014: Prepare for release 0.13.0 r=asomers a=asomers



Co-authored-by: Alan Somers <asomers@gmail.com>

Merge nix-rust#983

983: Bump version to 0.12.0 r=asomers a=asomers



Co-authored-by: Alan Somers <asomers@gmail.com>