1.64

• 1.62 2022-05-22 Added link to AccelStepper - The Missing Manual.
• Fixed a problem when setting the maxSpeed to 1.0 due to incomplete initialisation. Reported by Olivier Pécheux.
• 1.63 2022-06-30 Added virtual destructor at the request of Jan.
• 1.64 2022-10-31 Patch courtesy acwest: Changes to make AccelStepper more subclassable. These changes are largely oriented to implementing new step-scheduling algorithms.