chore(package): update grunt-contrib-clean to version 1.0.0
chore(package): update grunt-contrib-clean to version 1.0.0

http://greenkeeper.io/
piskelapp/piskel,smiegrin/piskel,juliandescottes/piskel,smiegrin/piskel,piskelapp/piskel,GMartigny/piskel,piskelapp/piskel,zoeesilcock/piskel,smiegrin/piskel,zoeesilcock/piskel,GMartigny/piskel,GMartigny/piskel,juliandescottes/piskel,juliandescottes/piskel,zoeesilcock/piskel