v6.0 beta

[dbhynds]

Summary of Changes

v6.0-beta release of the package. For major changes, see UPGRADES.md. Child PRs included within this one:

• https://github.com/packbackbooks/lti-1-3-php-library/pull/119
• https://github.com/packbackbooks/lti-1-3-php-library/pull/120
• https://github.com/packbackbooks/lti-1-3-php-library/pull/121
• https://github.com/packbackbooks/lti-1-3-php-library/pull/122
• https://github.com/packbackbooks/lti-1-3-php-library/pull/123
• https://github.com/packbackbooks/lti-1-3-php-library/pull/124
• https://github.com/packbackbooks/lti-1-3-php-library/pull/125
• https://github.com/packbackbooks/lti-1-3-php-library/pull/126
• https://github.com/packbackbooks/lti-1-3-php-library/pull/128

Testing

• [x] I have added automated tests for my changes
• [x] I ran composer test before opening this PR
• [x] I ran composer lint-fix before opening this PR

[codeclimate[bot]]

Code Climate has analyzed commit df9b2daa and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 97.5% (50% is the threshold).

This pull request will bring the total coverage in the repository to 97.9%.

View more on Code Climate.

[dbhynds]

Alright, ready for official release. Everything in this PR has been reviewed in previous PRs except for these changes: https://github.com/packbackbooks/lti-1-3-php-library/compare/f820c59e472a09f28383e515abd096e6e1c38411...df9b2daa7c8fc4ba8da6dcf5e31d616436e4bcd3

We've been running v6-beta in production for over a month now with no issue. It should be safe to release.