reactor/reactor-core v3.4.0-M1

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Reactor-Core 3.4.0-M1 is the first MILESTONE in the 2020.0.0-M1 Release Train (codename Europium).

Note that in terms of content this milestone is also aligned with what was released in 3.3.7.RELEASE

⚠️ Update considerations and deprecations

• Introduce Sinks and deprecate concrete processors (#2188)
  • more detailed migration notes to come
• Deprecate Schedulers.elastic for 3.5 removal (#1893)
  • This further enforces the use of the boundedElastic flavor
• Remove schedulers deprecated in 3.3 (#2208)

✨ New features and improvements

• Handle nulls from collectors in Flux.collect() (#2181)
• Have push(emitter) delegate to push(emitter, backpressure) (#2177)
• Align implementations of MonoCollect to be comparable to MonoCollectList (#2186)
• Bump the perf baseline to 3.3.6

🪲 Bug fixes

• Fix input package rule for OSGi metadata generator (#2185)

📖 Documentation, Tests and Build

• [build] master is 3.4 Europium, introduce new versioning scheme (#2140)
• [build] Ensure tools fat jar is the one published (#2189)
• [doc] Make ParallelFlux runOn methods doc consistent about work stealing (#2170)
• [doc] Fix 'decided' typo in coreFeatures.adoc (#2174)

👍 Thanks to the following contributors that also participated to this release

@jonenst , @rstoyanchev , @Inego , @gurkerl83