Show change to a feature

[planemad]

This is changeset map, but many times a data reviewer may be interested in the change to a certain feature. A use case is a automatic report that detects an object X was moved by a km.

How can someone use changeset-map to easily inspect the change just to feature X?

cc @batpad @ajithranka

[batpad]

Relates to https://github.com/osmlab/changeset-map/issues/11