golden: accept -update for updating files #235
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The
-test.update-goldenflag is long enough that it can be a challenge for people to remember, especially when golden files are not updated frequently. I've seen other implementations of this pattern use just the-updateflag, which was easier to remember.This PR keeps support for the existing
-test.update-goldenflag, but also adds-updateas an option for updating golden files.In the future there could be other auto-update operations that could make use of this same flag.