Travis: Manually update Composer when automatic update fails #35
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Description
This pull request fixes a case where Travis CI was not updating Composer to the latest stable version, causing builds with newer Composer config files to fail.
Motivation and Context
When Travis attempts to automatically update Composer to the latest version while using PHP 5.3.3, it fails because of SSL issues with Travis systems using PHP 5.3.3. This meant that tests were done using the pre-installed version of Composer, 1.0.0. This now presents a problem, as newer versions of Composer have introduced backwards-incompatible changes to the lock file format.
Tests performed
I ran the updated Travis scripts with pushes on my fork. The results may be found here.
Types of changes
Checklist:
I have added tests to cover my changes.