Support for opus audio type, experimental features toggle, epub reader starting point

package.json

@@ -1,6 +1,6 @@
 {
   "name": "audiobookshelf",
-  "version": "1.3.4",
+  "version": "1.3.5",
   "description": "Self-hosted audiobook server for managing and playing audiobooks",
   "main": "index.js",
   "scripts": {
@@ -27,6 +27,7 @@
     "bcryptjs": "^2.4.3",
     "command-line-args": "^5.2.0",
     "cookie-parser": "^1.4.5",
+    "epub": "^1.2.1",
     "express": "^4.17.1",
     "express-fileupload": "^1.2.1",
     "express-rate-limit": "^5.3.0",