[maven-release-plugin] copy for tag engine.io-client-0.8.3

[maven-release-plugin] copy for tag engine.io-client-0.8.2

[maven-release-plugin] copy for tag engine.io-client-0.8.1

[maven-release-plugin] prepare release engine.io-client-0.8.0

[maven-release-plugin] copy for tag engine.io-client-0.7.0

[maven-release-plugin] copy for tag engine.io-client-0.6.3

[maven-release-plugin] copy for tag engine.io-client-0.6.2

[maven-release-plugin] copy for tag engine.io-client-0.6.1

[maven-release-plugin] copy for tag engine.io-client-0.6.0

[maven-release-plugin] copy for tag engine.io-client-0.5.1