Allow for PHP8

Merge pull request #9 from silinternational/develop

Release 1.1.0 Allow for PHP8

Use version tag for `google/apiclient` dependency

Fixed

• Switch to tag for version constraint on google/apiclient dependency
• Use our standard PHP 7.4 Docker image for tests and composer updates

Added

• Add a make update command for easier updating of dependencies

---

That v1.1.9 tag refers to the exact commit we'd been using (19d7d735).

Updating dependencies

Change

• Update to PHP 7.4 (from PHP 7.2)
• Update to apiclient-services 0.176 (from 0.83)

Prepare for publishing

Fixed

• Pass application name on to Google_Client
• Add missing composer.json fields

Append data to Google Sheet

Added

• Ability to append (multiple rows of) data to a Google Sheet