Add REDISMODULE_NOTIFY_LOADED to NotifyEvent flags

Author: rcelha

src/raw.rs

@@ -105,6 +105,7 @@ bitflags! {
         const EVICTED = REDISMODULE_NOTIFY_EVICTED;
         const STREAM = REDISMODULE_NOTIFY_STREAM;
         const MODULE = REDISMODULE_NOTIFY_MODULE;
+        const LOADED = REDISMODULE_NOTIFY_LOADED;
         const ALL = REDISMODULE_NOTIFY_ALL;
     }
 }