UnitsNet.Serialization.JsonNet.nuspec: 1.0.0-alpha2 and update dependency
UnitsNet.Serialization.JsonNet.nuspec: 1.0.0-alpha2 and update dependency

Update dependency of main lib to 3.17.0, which has the BaseUnit property
on unit classes, needed for serialization.

anjdreas/UnitsNet,BrandonLWhite/UnitsNet,BoGrevyDynatest/UnitsNet,neutmute/UnitsNet,anjdreas/UnitsNet,BrandonLWhite/UnitsNet