add new dependencies

pituicat.cabal

@@ -21,5 +21,7 @@ executable pituicat
   -- other-extensions:
   build-depends:       base ^>=4.13.0.0
                      , affection
+                     , stm
+                     , sdl2
   hs-source-dirs:      src
   default-language:    Haskell2010

shell.nix

@@ -24,14 +24,14 @@ let
       license = stdenv.lib.licenses.lgpl3;
     }) {};
 
-  f = { mkDerivation, base, stdenv }:
+  f = { mkDerivation, base, stdenv, sdl2, stm }:
       mkDerivation {
         pname = "pituicat";
         version = "0.0.0.0";
         src = ./.;
         isLibrary = false;
         isExecutable = true;
-        executableHaskellDepends = [ affection base ];
+        executableHaskellDepends = [ affection base sdl2 stm ];
         license = stdenv.lib.licenses.gpl3;
       };