v0.2.0

Changes in this release:

• Support for T variants: LP5860T, LP5861T, LP5866T, LP5868T
• Support for LP5866
• ConfigBuilder is now an empty, generic-free struct that provides device-specific
  new_*() methods. These return a ConfigBuilderDeviceSpecific.
• LP586x::new_*() methods now take a impl DelayNs instead of &mut impl DelayNs.
  This usually shouldn't require code changes.