Update release schedule for 2022

[dkorpel]

There was a large gap between 2.098 (October 2021) and 2.099 (March 2022), but I think we're back on track with 2.100

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[ibuclaw]

I'll be moving the release process into a more automated set-up, so it'll likely be 2022-07-15 that the next beta will be made (also personally it would be great if a DMD major release didn't collide with a GCC major release in May).

[dkorpel]

And will releases then continue in even numbered months?

[ibuclaw]

Yep.

[dkorpel]

I changed it