v0.3.0 is not available on maven central

[FlyingPig525]

It seems 0.3.0 has not been published to maven central, and only 0.4.0-beta.0 is there.

[oglassdev]

Would it be possible for you to update to 0.4.0-beta.0? If not, I can release 0.3.0

[FlyingPig525]

I have updated to 0.4.0, but it is kind of inconvenient that a normal release is not accessible, while a beta release is