Bump to 3.0.0-beta
Bump to 3.0.0-beta

Update release notes

maherkassim/UnitsNet,anjdreas/UnitsNet,BrandonLWhite/UnitsNet,maherkassim/UnitsNet,Tirael/UnitsNet,anjdreas/UnitsNet,BoGrevyDynatest/UnitsNet,BrandonLWhite/UnitsNet,neutmute/UnitsNet