Version 2.0

[joaorobertopb]

Description

This big PR will:

• Drop support for Laravel <6.0;
• Bump PHP minimun version to 7.2.5+;
• Support PHP 8;
• Update dependency constraints in composer.json;
• Recfator all tests:
  • Remove deprecated functions e prepare code to use phpunit 9.0 version;
  • Improvements tests coverage;
• Fix RemoveComments middleware, now it remove JS and CSS comments;
• Fix CollapseWhitespace, now dependent on 'RemoveComments' middleware;
• Update the old phpunit.xml configuration file;
• Update the .travis.yml file and run the tests against in PHP 7.3 / PHP 7.4 / PHP 8;
• Update README.md;

Motivation and context

Why is this change required? What problem does it solve?

It fixes: #30 #46 #55 #57 #77 #82 #107 #108 #122 #129 #136 #141

The CollapseWriteSpace::class filter was producing a bug when the HTML contains inline JS comments.... All JS code after the inline comment was also commented!

How has this been tested?

Refactoring and improve test coverage.

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [x] Bugfix / Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

Please, please, please, don't send your pull request until all of the boxes are ticked. Once your pull request is created, it will trigger a build on our continuous integration server to make sure your tests and code style pass.

• [x] I have read the CONTRIBUTING document.
• [x] My pull request addresses exactly one patch/feature.
• [x] I have created a branch for this patch/feature.
• [x] Each individual commit in the pull request is meaningful.
• [x] I have added tests to cover my changes.
• [x] If my change requires a change to the documentation, I have updated it accordingly.

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