fix/flake.lock

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1614309161,
        "narHash": "sha256-93kRxDPyEW9QIpxU71kCaV1r+hgOgP6/aVgC7vvO8IU=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "0e499fde7af3c28d63e9b13636716b86c3162b93",
        "type": "github"
      },
      "original": {
        "id": "nixpkgs",
        "ref": "nixos-20.09-small",
        "type": "indirect"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      }
    }
  },
  "root": "root",
  "version": 7
}