Release v0.3.1

[at-wat]

Bug fixes (from v0.3.0)

• Clear recv buffer by start byte (Clear recv buffer by start byte #68)
• Remove incorrect pInterfaces init (Remove incorrect pInterfaces init #64)
• Fix velocity control loop counter initialization (Fix velocity control loop counter initialization #63)

[at-wat]

It's been tested enough on the real hardware. Making a new release.