Request to tag latest commit as v0.3.0

[rogers0]

I packaged this library into Debian:

• https://tracker.debian.org/pkg/bigdoc

The version 0.3.0 got from README.md, which is also the same as pom.xml
Would you kindly tag latest commit as v0.3.0?
So Debian's system can detect new version when you release a new one.
Thank you!