[maven-release-plugin] copy for tag druid-0.3.21

[maven-release-plugin] copy for tag druid-0.3.20

[maven-release-plugin] copy for tag druid-0.3.19

[maven-release-plugin] copy for tag druid-0.3.18

[maven-release-plugin] copy for tag druid-0.3.16

[maven-release-plugin] copy for tag druid-0.3.15

[maven-release-plugin] copy for tag druid-0.3.14

[maven-release-plugin] copy for tag druid-0.3.13

[maven-release-plugin] copy for tag druid-0.3.12

[maven-release-plugin] copy for tag druid-0.3.11