add `instant` dependency for time in wasm build

Cargo.toml

@@ -28,6 +28,7 @@ log = "0.4"
 bitflags = "1.3.2"
 reorder = "2.1"
 resources = "1.1"
+instant = "0.1"
 
 [dev-dependencies]
 fastrand = "1.8"

src/widgets/text_box.rs

-use std::time::Instant;
+use instant::Instant;
 
 use bevy::prelude::*;
 use kayak_font::{KayakFont, TextProperties};