Remove trailing comma in JSON

manifests/Qwelk.json

@@ -3,5 +3,5 @@
   "author": "raincheque (Parsa Jamshidi)",
   "licese": "MIT",
   "manualUrl": "https://github.com/raincheque/qwelk/blob/master/README.md",
-  "sourceUrl": "https://github.com/raincheque/qwelk",
+  "sourceUrl": "https://github.com/raincheque/qwelk"
 }

manifests/mscHack.json

@@ -3,5 +3,5 @@
   "author": "Mark Schack",
   "license": "MIT",
   "manualUrl": "https://github.com/mschack/VCV-Rack-Plugins/blob/master/README.md#demo-vids",
-  "sourceUrl": "https://github.com/mschack/VCV-Rack-Plugins",
+  "sourceUrl": "https://github.com/mschack/VCV-Rack-Plugins"
 }