[2.2.0] - 19.06.2019

Added

• Enabled configuration of rate at which the monitoring thread checks on components/hosts.
• Added possibility to specify optional requirements for components. This is useful for combination with the exclude
  feature.

Changed

• Moved user interfaces and graph drawing to external libraries

Fixed

• Having requires or depends defined as empty list does not cause an exception anymore.
• Program will exit with correct exit code on missing urwid installation after showing the error output.