Homebrew requires Ruby 2.6, Travis provides 2.3.3


For several weeks, we’ve been getting error messages like this when we try to use any brew commands inside of our macOS build:

Homebrew must be run under Ruby 2.6! You’re running 2.3.3

Example build: https://travis-ci.org/terralang/terra/jobs/624807937

This seems to make it impossible to actually use Homebrew from inside of Travis. Is there a workaround or can this be fixed?

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