v1.4.1

ControlSystems v1.4.1

Diff since v1.4.0

Closed issues:

• Discontinuous Root Locus (#740)

Merged pull requests:

• add Mt_lines option to gofplot (#737) (@baggepinnen)
• remove direct dependency on Colors (#739) (@baggepinnen)
• Fix rlocus when poles cross in both real and imag (#741) (@baggepinnen)