Fix preonic/rev2 bootloader config

uplus · jackhumbert · commit e8e999dcc0d9 · 2018-03-13T02:22:10.000-04:00
diff --git a/keyboards/preonic/rev2/info.json b/keyboards/preonic/rev2/info.json
@@ -1,3 +1,4 @@
 {
-  "identifier": "FEED:6061:0002"
-}
+  "identifier": "FEED:6061:0002",
+  "bootloader": "qmk-dfu"
+}
