Optimize CalendarHeader to not rerender if current month wasn't changed
Optimize CalendarHeader to not rerender if current month wasn't changed

rscnt/material-ui,oliviertassinari/material-ui,mbrookes/material-ui,mui-org/material-ui,callemall/material-ui,mbrookes/material-ui,oliviertassinari/material-ui,mui-org/material-ui,rscnt/material-ui,callemall/material-ui,mbrookes/material-ui,callemall/material-ui,mui-org/material-ui,oliviertassinari/material-ui,rscnt/material-ui,dmtrKovalenko/material-ui-pickers,callemall/material-ui,dmtrKovalenko/material-ui-pickers