update versions in readme

README.md

@@ -19,6 +19,7 @@ The current official image for [nix](https://hub.docker.com/r/nixos/nix/) is bas
 
 All the images are based on the latest baseimage, previous versions are available in my repository [https://hub.docker.com/r/lnl7/nix/tags](https://hub.docker.com/r/lnl7/nix/tags).
 
+- `lnl7/nix:2018-03-13` (2.0)
 - `lnl7/nix:2018-01-13` (1.11.16)
 - `lnl7/nix:2017-10-07` (1.11.15)
 - `lnl7/nix:2017-06-17` (1.11.10)
@@ -41,7 +42,7 @@ nix-repl>
 ## Building an Image
 
 ```Dockerfile
-FROM lnl7/nix:1.11.16
+FROM lnl7/nix:2.0
 
 RUN nix-env -iA \
  nixpkgs.curl \
@@ -57,7 +58,7 @@ nix-shell -A env --run './result/bin/run-docker-build'
 The `src` can also can be overridden to use a custom [nixpkgs](https://github.com/NixOS/nixpkgs) for the image.
 
 ```sh
-nix-shell -A env --argstr src ./srcs/2018-01-13.nix
+nix-shell -A env --argstr src ./srcs/2018-03-13.nix
 ```
 
 ## Running as a [remote builder](https://nixos.org/wiki/Distributed_build)