Merge pull request #12 from cuviper/nix-0.14

Update nix to 0.14

Author: tailhook

Cargo.toml

@@ -13,7 +13,7 @@ authors = ["[email protected]"]
 
 [dependencies]
 libc = "0.2.28"
-nix = "0.13"
+nix = "0.14"
 quick-error = "1.2.0"
 
 [dev-dependencies]