update package.json name/description

package.json

@@ -1,7 +1,7 @@
 {
-  "name": "opensheetmusicdisplay-private",
+  "name": "osmd-extended",
   "version": "1.3.1",
-  "description": "Private OSMD mirror/audio player.",
+  "description": "Private / sponsor exclusive OSMD mirror/audio player.",
   "main": "build/opensheetmusicdisplay.min.js",
   "typings": "build/dist/src/",
   "scripts": {