[maven-release-plugin] prepare release NioSmtpClient-1.2.1

[maven-release-plugin] prepare release NioSmtpClient-1.2.0

[maven-release-plugin] prepare release NioSmtpClient-1.1.2

[maven-release-plugin] prepare release NioSmtpClient-1.1.1

[maven-release-plugin] prepare release NioSmtpClient-1.1.0