Point at the preview branch's manifest with a preview release.

Author: mooped

system.json

@@ -28,7 +28,7 @@
   "socket": true,
   "initiative": "1d20 + @attributes.init.value",
   "url": "https://github.com/cyface/foundryvtt-dcc",
-  "manifest": "https://github.com/cyface/foundryvtt-dcc/raw/master/system.json",
-  "download": "https://github.com/cyface/foundryvtt-dcc/archive/v0.0.21.zip",
+  "manifest": "https://github.com/cyface/foundryvtt-dcc/raw/preview/system.json",
+  "download": "https://github.com/cyface/foundryvtt-dcc/archive/v0.0.21_preview.zip",
   "license": "LICENSE.txt"
 }