hostapd: use WPA2 instead of WPA1 by default

nixos/doc/manual/release-notes/rl-1809.xml

@@ -330,6 +330,11 @@ inherit (pkgs.nixos {
      will be added to <literal>environment.systemPackages</literal>.
     </para>
    </listitem>
+   <listitem>
+    <para>
+      The module <option>services.networking.hostapd</option> now uses WPA2 by default.
+    </para>
+   </listitem>
   </itemizedlist>
  </section>
 </section>

nixos/modules/services/networking/hostapd.nix

@@ -29,7 +29,7 @@ let
     ctrl_interface_group=${cfg.group}
 
     ${if cfg.wpa then ''
-      wpa=1
+      wpa=2
       wpa_passphrase=${cfg.wpaPassphrase}
       '' else ""}