My solution :)

[Kocian]

if(MyRigidBody.velocity.x > Mathf.Epsilon || MyRigidBody.velocity.x < Mathf.Epsilon)
        {
        transform.localScale = new Vector2 (Mathf.Sign(MyRigidBody.velocity.x), 1f);
        }

[Kevin-Brandon]

Good job with your solution!