Add rollForward=latestMinor in global.json
Add rollForward=latestMinor in global.json

So that people can work with NodaTIme with any .NET Core 3.x SDK, see https://andrewlock.net/exploring-the-new-rollforward-and-allowprerelease-settings-in-global-json/ 

Note that rollForward policies are not (yet) supported by Rider: https://youtrack.jetbrains.com/issue/RIDER-38533
malcolmr/nodatime,nodatime/nodatime,BenJenkinson/nodatime,BenJenkinson/nodatime,malcolmr/nodatime,nodatime/nodatime,malcolmr/nodatime,malcolmr/nodatime