snake: decrease timeout to make it faster

src/snake.ts

@@ -64,7 +64,7 @@ class SnakeCore {
         this.canvas = document.getElementById('snake') as HTMLCanvasElement;
         this.context = this.canvas.getContext('2d') as CanvasRenderingContext2D;
         this.grid = 25; // size of grid squares
-        this.timeout = 100; // speed in ms
+        this.timeout = 20; // speed in ms
         this.width = 25;
         this.height = 15;
         this.board = [];