[maven-release-plugin] prepare release korean-text-2.1
[maven-release-plugin] prepare release korean-text-2.1

JisuPark/twitter-korean-text,nlpenguin/twitter-korean-text,ellen24h/twitter-korean-text,iluxa-com/twitter-korean-text,ahastudio/twitter-korean-text,jun85664396/twitter-korean-text,cedar101/twitter-korean-py,NamHosung/SE,tglstory/twitter-korean-text,open-korean-text/open-korean-text,modamoda/twitter-korean-text