No Git tag for version 2.3.0

Hello,

I saw that on the GitHub repo the last released version is 2.2.0 However, in maven repo there is a newer version https://mvnrepository.com/artifact/uk.co.chrisjenx/calligraphy/2.3.0

Can you explain please the reason why not having a 2.3.0 git tag in this repo please ?