TJ Miller shares a cool Travis config to tests against all versions of Laravel.

As Laravel 5.7 is now out, I needed to add support to both the package’s composer configuration and verification in CI. Previously, I only needed to verify against 5.5 and 5.6 I thought that having --prefer-lowest in the matrix would add the coverage I needed. Now that I am supporting three versions I felt that I needed a more specific way of verifying compatibility with different versions of Laravel.