- Update to 0.9.4
* Sisotool: Fix Matplotlib deprecation of axis share handling by
@bnavigator in #834
* Fix Interconnect name clobbering by @henklaak in #857
* Solve #862 and #864: bode_plot phase wrapping incorrect for
multiple systems by @henklaak in #863
* Fix root_locus() handling of ax parameter by @henklaak in #871
* Small fixes based on Caltech CDS 112 course by @murrayrm in
#849
* Feature print zpk by @henklaak in #869
* Feature enable doctest by @henklaak in #868
* Optimization-based and moving horizon estimation by @murrayrm
in #877
* new examples for Simulink-like interconnection of digital and
nonlinear systems by @sawyerbfuller in #882
* fix blank bode plot in rootlocus_pid_designer by @sawyerbfuller
in #883
* bandwidth feature by @SCLiao47 in #889
* update nyquist_plot for DT transfer functions with poles at 0
and 1 by @sawyerbfuller in #885
* Add missing labels when returning TimeResponseData by
@joaoantoniocardoso in #892
* fix damp command natural frequency printout for discrete poles
on real axis by @sawyerbfuller in #894
* Add H2 and Hinf synthesis examples by @jrforbes in #895
* warn if prewarp-frequency is not used by @sawyerbfuller in #900
* make _convert_to_statespace properly pass signal and system
names by @sawyerbfuller in #884
* Change name of converted LinearIOSystems by @murrayrm in #903
* add/cleanup documentation on simulation functions by @murrayrm