• Added support for dynamic attribution prop in layers.
• Added MapEvented abstract class used by MapComponent and Map.
• [website] Added react-leaflet-freedraw plugin (PR #508 by elangobharathi).
• [website] Updated "Lifecycle process" overview (PR #509 by clintharris).
• [website] Added react-leaflet-distortable-imageoverlay plugin (PR #511 by ChrisLowe-Takor).
• [website] Fixed typo in docs (PR #513 by Roconda).
• [website] Added react-leaflet-sidetabs plugin (PR #517 by eferhatg).
• [website] Added leaflet-react-track-player plugin (PR #523 by argonavt11).
• [website] Added react-leaflet-wmts plugin (PR #524 by mpivaa).
• [internal] Updated Babel dependency to v7.