[maven-release-plugin] copy for tag kojiji-2.21

[maven-release-plugin] copy for tag kojiji-2.20

[maven-release-plugin] copy for tag kojiji-2.19

retag 2.18

[maven-release-plugin] copy for tag kojiji-2.17

[maven-release-plugin] copy for tag kojiji-2.16

[maven-release-plugin] copy for tag kojiji-2.15

[maven-release-plugin] copy for tag kojiji-2.14

[maven-release-plugin] copy for tag kojiji-2.13

[maven-release-plugin] copy for tag kojiji-2.12