PHP 8 support

[tobias-trozowski]

Q	A
New Feature	yes

Description

Updating to add PHP 8.0 support for #14

In order to make this repository compatible, one has to follow these steps:

• [x] Modify composer.json to provide support for PHP 8.0 by adding the constraint ~8.0.0
• [x] Modify composer.json to drop support for PHP less than 7.3
• [x] Modify composer.json to implement phpunit 9.3 which supports PHP 7.3+
• [x] Modify .travis.yml to ignore platform requirements when installing composer dependencies (simply add --ignore-platform-reqs to COMPOSER_ARGS env variable)
• [x] Modify .travis.yml to add PHP 8.0 to the matrix (NOTE: Do not allow failures as PHP 8.0 has a feature freeze since 2020-08-04!)
• [x] Updated phpunit.xml.dist to fullfil schema

Closes #14

[froschdesign]

@tobias-trozowski I'm sorry for the late response.

The XML configuration file for PHPUnit also needs an update:

<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
         bootstrap="vendor/autoload.php"
         colors="true">
    <testsuites>
        <testsuite name="laminas-i18n-resources Test Suite">
            <directory>./test</directory>
        </testsuite>
    </testsuites>
    <coverage>
        <include>
            <directory suffix=".php">./src</directory>
        </include>
    </coverage>
</phpunit>

Reference: https://phpunit.readthedocs.io/en/9.5/configuration.html#the-coverage-element

Thanks in advance!

[tobias-trozowski]

@froschdesign all done

[froschdesign]

@tobias-trozowski Could you rebase against the branch 2.7.x? This will use the new CI workflow. Thanks in advance! 👍

[froschdesign]

Fixed with #18