Merge branch 'master' of https://github.com/Coder-JJ/rc-leaflet.git

feature: totally rewrite MassPoints.

Signed-off-by: wgj <wgj>

v1.4.0

Signed-off-by: wgj <wgj>

v1.2.2

Signed-off-by: wgj <wgj>

update: README.md and UPDATE.md.

Signed-off-by: wgj <wgj>

feature: new Component Point.Content

Signed-off-by: wgj <wgj>

fix: handle the edge case when layer of `DivOverlay` is changed.

Signed-off-by: wgj <wgj>

fix: unbind map events when MassPoints is unmounted.

Signed-off-by: wgj <wgj>

fix: RCMap bounds Bug.

Signed-off-by: wgj <wgj>

feature: add MassPoints and ClusterPoints Components.

Signed-off-by: wgj <wgj>