v0.12.12

ControlSystems v0.12.12

Diff since v0.12.11

Closed issues:

• Equivalent to Simulink "Saturation" block (#228)
• Update plotting changes in readme (#672)
• How to generate frequency-response data? (#677)
• Can't precompile ControlSystems (#678)
• Delays cause step and friends to error out. (#679)

Merged pull requests:

• add docs for nonlinear functionality (#671) (@baggepinnen)
• Update README.md (#673) (@baggepinnen)
• zpk conjugate pairup fails on 0.0 and -0.0 (#674) (@albheim)
• Correct nothing comparison (#675) (@albheim)
• add ILC tutorial (#680) (@baggepinnen)
• add docs on creating delay system (#681) (@baggepinnen)
• provide in-place version of lsim (#682) (@baggepinnen)
• Better bode performance (#683) (@baggepinnen)
• add constructors for workspaces (#684) (@baggepinnen)