Update php-coveralls/php-coveralls from v2.1.0 to v2.2.0

[violinist-bot]

If you have a high test coverage index, and your tests for this pull request are passing, it should be both safe and recommended to merge this update.

Here is a list of changes between the version you use, and the version this pull request updates to:

• 3e6420f Prepare v2.2.0
• 1b3d14a Add possibility to change entry point (Fixed logout command pantheon-systems/terminus#269)
• 6b2b82f Allow Symfony 5 (Updated dependencies pantheon-systems/terminus#274)
• 5267300 DX: Update PHP CS Fixer (Updating Guzzle dependency pantheon-systems/terminus#277)
• ecfad87 Update minimum version of symfony/yaml to 2.0.5 (Behat testing with PHP-VCR implemented pantheon-systems/terminus#268)
• 98c34a0 DX: Fix PHPMd config, allowing build to pass (Initial working tunnel commands pantheon-systems/terminus#276)
• 0de855a Add --dev to install step (Behat vcr pantheon-systems/terminus#267)

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