manage_libraryをfalseに (#77)

Author: Hiroshiba

engine/engine_manifest.json

@@ -3,5 +3,12 @@
     "name": "VOICEVOX Engine",
     "brand_name": "VOICEVOX",
     "url": "https://github.com/VOICEVOX/voicevox_engine",
-    "default_sampling_rate": 24000
+    "default_sampling_rate": 24000,
+    "supported_features": {
+        "manage_library": {
+            "type": "bool",
+            "value": false,
+            "name": "音声ライブラリのインストール・アンインストール"
+        }
+    }
 }