3.0.0-RC4 release preparations

[akarnokd]

Version 3.0.0-RC4 - October 20, 2019 (Maven)

Javadocs

This is an early release for 3.0.0 to allow preparations for the breaking API changes and cleanups.

Please check out the wiki page What's different in 3.0 from time to time for the details and migration guide.

Bugfixes

• Fix groupBy group emission in some cases. (3.x: Fix groupBy group emission in some cases #6664)
• Fix concurrent clear() calls when fused chains are canceled. (3.x: Fix concurrent clear() calls when fused chains are canceled #6676)
• Fix window(time) possible interrupts while terminating (3.x: Fix window(time) possible interrupts while terminating #6674)

Documentation enhancements

• Add missing marble diagams to Single (3.x: Add missing marble diagams to Single #6668)

Other

• Add Export-Package declarations for OSGi headers (Add Export-Package declarations for OSGi headers #6675)

[akarnokd]

Closing via v3.0.0-RC4.