Add 'fly' as an alias for Flight

src/main/kotlin/codes/som/hibiscus/features/movement/Flight.kt

@@ -76,4 +76,9 @@ class Flight : Feature("Flight", FeatureCategory.MOVEMENT) {
     override fun onDisable() {
         player.abilities.flying = false
     }
+
+    override fun createFeatureCommand() =
+        super.createFeatureCommand().apply {
+            alias("fly")
+        }
 }