CHANGELOG.rst: added note about isVisible(checkOverride)
CHANGELOG.rst: added note about isVisible(checkOverride)

shrtcww/pymel,assumptionsoup/pymel,AtonLerin/pymel,juggernate/pymel,assumptionsoup/pymel,shrtcww/pymel,juggernate/pymel,AtonLerin/pymel,david-lassonde-adsk/pymel,leonsooi/pymel,leonsooi/pymel,david-lassonde-adsk/pymel