Prevent from TPing into a wall.

game.go

@@ -177,8 +177,8 @@ func quit(game *Game) {
 func (game *Game) randPos() Position {
 	var pos Position
 
-	x := 1 + rand.Intn(77)
-	y := 1 + rand.Intn(22)
+	x := 2 + rand.Intn(76)
+	y := 2 + rand.Intn(21)
 
 	pos.x = x
 	pos.y = y