Release version 0.3.0

[ukBaz]

• Peripheral notification improvements
• fix micro:bit bug loading gatt services twice
• add bytes type to send_notify_event
• add device parameter to on_connection/on_disconnection callback

[codecov-io]

Codecov Report

Merging #251 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #251   +/-   ##
=======================================
  Coverage   64.79%   64.79%           
=======================================
  Files          30       30           
  Lines        2193     2193           
=======================================
  Hits         1421     1421           
  Misses        772      772

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