Add Vladimir Chukharev to contributors

Maintainer of:
devel/py-apptools
devel/py-envisage
devel/py-pyface
devel/py-robotframework
devel/py-robotframework-pabot
devel/py-robotframework-ride
devel/py-robotframework-selenium2library
devel/py-robotremoteserver
graphics/py-mayavi
graphics/py-traitsui
ports-mgmt/porttree
www/py-django-allauth

PR: 221152