Bump package version to v2.1.0
Bump package version to v2.1.0

kleetus/bitcore-node,braydonf/bitcore-node,snogcel/bitcore-node-dash,zcoinrocks/bitcore-node,braydonf/bitcore-node,snogcel/bitcore-node-dash,zcoinrocks/bitcore-node,kleetus/bitcore-node