fix json syntax

Author: nift4

devices/vayu.json

@@ -5,7 +5,7 @@
   },
   "bootloader": {
     "url": "https://open-rom-project.andbootmgr.org/vayu/droidboot.img",
-    "sha256": "748a299e8100a45a84ddccef8f688bb9277f96b6d3c0671f90d3f1f61c28bac6"
+    "sha256": "748a299e8100a45a84ddccef8f688bb9277f96b6d3c0671f90d3f1f61c28bac6",
     "version": 1
   },
   "deviceInfo": {