go.mod: update x/crypto to bring in fix for golang/go#36609#9

Merged

sthagen merged 1 commit intosthagen:masterfrom FiloSottile:master

Feb 21, 2020

+3-3

Commits on Feb 20, 2020

go.mod: update x/crypto to bring in fix for golang/go#36609
FiloSottile
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