Propel
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Have travis CI use older version of composer to avoid case issues with pear package.
I noticed that the CI tests were failing due to a simple warning elevated to error about casing of the pear packages. So this is my attempt to resolve that issue.
This didn't turn out well, it is now giving an error PEAR packages were removed from composer 2.0 - so evidently the fix requires further tinkering with the dependencies of composer and limiting the version travis uses.
So the fix here evidently is to have travis use composer 1.8 vs. the latest one. It no longer complains about case and doesn't break the integration tests.