[0.2.1] - 2020-05-29

Added

• The safetyMultiplier, which adds 5% to the current speed.
  This will lead to earlier warnings, and just slower driving in general.
• More debugging serial output. Now in the form of NMEA messages.

Changed

• Major overhaul of GPS serial data handling.
• Removed frame which surrounds the UI on the OLED.
• Current list of speed limits.
• Logic for storing new GPS readings.
• Flipped the OLED orientation.
• Debug serial baud rate is now 1843200
  (not useful to link it to the GPS baud rate anymore).
• Doesn't keep buzzing if GPS signal is lost while
  speeding is detected.
• The u8g2 library class instance is now an global variable,
  instead of manually passing a reference to it in constructors.
• Travis builds are now initially published as drafts.
• Moving average now only considers past 3 readings (750ms), not 10.

Fixed

• Incorrect declaration of number of possible speed limits
  no longer results in accessing beyond the end of an array
  when changing the current limit.