allow happy ==2.0.2 || >=2.1.2 && <2.2 #278
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in digital-asset#565 we allowed happy build depends < 2.1 so as to allow happy-2.0.2 (2.1 was marked deprected). since then happy 2.1.1 and 2.1.2 were released (2.1.1 is also marked deprecated). this then resulted in issue digital-asset#566 which this fixes. so, i'm changing the bounds to
happy:happy == 1.20.* || == 2.0.2 || >= 2.1.2 && < 2.2
. this change puts us out of step with GHC itself which is still < 2.1 but i guess it will catch up.