[maven-release-plugin] prepare release v1-1.6
[maven-release-plugin] prepare release v1-1.6

coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk,coinapi/coinapi-sdk