v0.4.0

What's Changed

• Bump actions/upload-artifact from 2 to 3 by @dependabot in #31
• Bump com.diffplug.spotless from 6.4.1 to 6.4.2 by @dependabot in #29
• Variety of changes: null literals, throttle writer, GC, etc. by @kosak in #30
• Split CSV tutorial into two files: README.md and ADVANCED.md by @kosak in #32
• Annotate java code blocks by @devinrsmith in #33

Full Changelog: v0.3.0...v0.4.0