MNT: matplotlib 3.4.0 broke plot_obs-planning.py
MNT: matplotlib 3.4.0 broke plot_obs-planning.py

lpsinger/astropy,lpsinger/astropy,mhvk/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,larrybradley/astropy,saimn/astropy,aleksandr-bakanov/astropy,astropy/astropy,pllim/astropy,larrybradley/astropy,saimn/astropy,astropy/astropy,pllim/astropy,larrybradley/astropy,mhvk/astropy,StuartLittlefair/astropy,larrybradley/astropy,mhvk/astropy,larrybradley/astropy,saimn/astropy,lpsinger/astropy,astropy/astropy,astropy/astropy,mhvk/astropy,pllim/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,lpsinger/astropy,saimn/astropy,aleksandr-bakanov/astropy,mhvk/astropy,pllim/astropy,saimn/astropy,pllim/astropy,astropy/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy