This is the first GA release of the new 2020.0.0 cycle (codename Europium)

Highlights:

• 💪 a packed release of reactor-core => 3.4.0
• 🎉 reactor-netty reaching 1.0.0
• ✨ a do-over of reactor-kafka => 1.3.0
• reactor-pool 0.2.0
• reactor-addons 3.4.0