Add pre-release notes for 3.0.0
Add pre-release notes for 3.0.0

fevxie/connector,maljac/connector,dvitme/connector,zhaohuaw/connector,brain-tec/connector,mohamedhagag/connector,acsone/connector,BT-ojossen/connector,Antiun/connector,open-synergy/connector,MindAndGo/connector,brain-tec/connector,zhaohuaw/connector,gurneyalex/connector,sylvain-garancher/connector,hugosantosred/connector,brain-tec/connector,Endika/connector,esousy/connector,sylvain-garancher/connector,hugosantosred/connector,acsone/connector,anybox/connector,MindAndGo/connector,Antiun/connector,BT-fgarbely/connector,BT-fgarbely/connector,open-synergy/connector,maljac/connector,acsone/connector,anybox/connector,dvitme/connector,esousy/connector,BT-jmichaud/connector,BT-ojossen/connector,fevxie/connector,gurneyalex/connector,mohamedhagag/connector,BT-jmichaud/connector,js-landoo/connector,Endika/connector,js-landoo/connector