update nix expression

shell.nix

@@ -5,44 +5,23 @@ with pkgs.lib;
 let
 
 modes = {
-  shell = "exec zsh";
+  shell = "exec fish";
   test  = "npm test";
-  run   = "exec bin/hubot";
-  runTg = ''
-    telegram-cli \
-      -dWE                \
-      -Z $HUBOT_TG_SCRIPT \
-      -P $HUBOT_TG_PORT   > /dev/null 2>&1 &
-    bin/hubot -a tg
-    pkill -9 telegram-wo-key; exit
-  '';
-};
-
-telegram = pkgs.telegram-cli.override {
-  python = pkgs.python3;
+  run   = "exec bin/hubot -a matrix";
 };
 
 in pkgs.stdenv.mkDerivation rec {
   name = "asjon-dev";
   source = ".";
 
-  buildInputs = node ++ external;
-  node = with pkgs.nodePackages; [
-    pkgs.nodejs
-    mocha
-    coffee-script
-  ];
-  external = with pkgs; [
-    zsh
-    telegram
-    graphicsmagick
+  node = with pkgs; [
+    nodejs nodePackages.coffee-script
+    openssh graphicsmagick
   ];
 
   shellHook = environment + getAttr mode modes;
   environment = ''
     #set env variables here
-    export HUBOT_TG_SCRIPT=node_modules/hubot-tg/hubot.py
-    export HUBOT_TG_PORT=1123
-    export ADMIN_ROOM=user#123456
+    export AUTO_KILL_ON_UPDATE=1
   '';
 }