chore: add npm ignore file

chore: add babel settings

chore: bump version to 2.4.0-rc

chore: bump version to v2.3.0

chore: bump version to v2.2.2

chore: bump version to v2.2.1

chore: bump to v2.1.1 (hiwllc#16)

chore: bump to version v2.1.0

chore: bump to version v2.0.0

chore: bump to version v1.0.0