Bump to v0.6.1-pre

Author: kamalmarhubi

Cargo.toml

@@ -2,7 +2,7 @@
 
 name        = "nix"
 description = "Rust friendly bindings to *nix APIs"
-version     = "0.6.0"
+version     = "0.6.1-pre"
 authors     = ["Carl Lerche <[email protected]>"]
 homepage    = "https://github.com/nix-rust/nix"
 repository  = "https://github.com/nix-rust/nix"