v0.4.22

RobustAndOptimalControl v0.4.22

Diff since v0.4.21

Merged pull requests:

• give better names to sensitivity IO after feedback (#79) (@baggepinnen)
• add simple model reduction for uncertain models (#81) (@baggepinnen)
• add plots to nugap examples (#82) (@baggepinnen)
• plot true system in uncertainty example for comparison (#83) (@baggepinnen)
• add example of cascade control (#84) (@baggepinnen)
• add balancing for uncertain matrices (#85) (@baggepinnen)