v2.0.3

Added

• attribution from service metadata is now automatically displayed in Leaflet's attribution control for all layer types #832, #842 (thank you@tyleralves!)
• Powered by Esri is now displayed in Leaflet's attribution control when any layer type is added to the map, not just L.esri.basemapLayer.
• the attribution control is restricted to a single line, but expands to show all data contributors on mouse hover.
• support for DynamicMapLayer services that require a token to be passed in a request for raw images #830 (thank you@jaredbrookswhite!)