Prepare v2.1.0 release.

Signed-off-by: crynobone <crynobone@gmail.com>
Fix typo on changelog.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.0' into 2.1
Remove dev prefix.

Signed-off-by: crynobone <crynobone@gmail.com>