3.0.0-RC1 release preparations

[akarnokd]

Version 3.0.0-RC1 - July 12, 2019 (Maven)

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.

API changes

• Rename onErrorResumeNext(<source>) to onErrorResumeWith(<source>) to avoid lambda ambiguity with onErrorResumeNext(Function). (3.x: remove unnecessary static imports from unit tests #6550)
• Remove buffer(Supplier) variants (3.x: remove buffer/window with supplier & onExceptionResumeNext #6564)
• Remove window(Supplier) variants (3.x: remove buffer/window with supplier & onExceptionResumeNext #6564)
• Remove onExceptionResumeNext (3.x: remove buffer/window with supplier & onExceptionResumeNext #6564)

Behavior changes

No behavior changes in this release.

Bugfixes

• Fix NPE when debouncing empty source (3.x Fix NPE when debouncing empty source #6559)

Documentation enhancements

• Fix wording in Single javadocs (3.x: fix wording in Single javadocs #6566)

Other

• Fixing version tag since Schedulers.from(Executor, boolean) has been promoted. (Fixing version tag on Schedulers.from(Executor, boolean) #6544)
• Simplify JUnit tests with more appropriate assert methods (3.x: Simplify JUnit tests with more appropriate assert methods #6549)
• Remove unnecessary static imports from unit tests (3.x: remove unnecessary static imports from unit tests #6550)