Update manifest with BSML requirement.

SongBrowserPlugin/manifest.json

@@ -9,7 +9,8 @@
   "dependsOn": {
     "SongCore": "^3.0.0",
     "SongDataCore": "^1.3.4",
-    "BSIPA": "^4.1.2"
+    "BSIPA": "^4.1.2",
+    "BeatSaberMarkupLanguage": "^1.4.0"
   },
   "misc": {
     "plugin-hint": "SongBrowser.Plugin"