chore(packaging): bump version to 2.0.0-alpha.21; add changelog 

chore(packaging): bump version to 2.0.0-alpha.20 

chore(packaging): bump version to 2.0.0-alpha.19 

chore(release): bump version to 2.0.0-alpha.18 For docs

chore(release): bump version Somehow the version bump from alpha.16 was not submitted to master…

bump version to 2.0.0-alpha.16 

chore: bump up the version to 2.0.0-alpha.15 

chore(packaging): bump version to alpha.14 

release 2.0.0-alpha.13 on npm/pub