Upgrade to php 7.4

What's Changed

• Fix namespaces in test classes by @nootanghimire in #9
• Add Code Climate integration for unit tests by @ariskataoka in #11
• Add police configuration by @estringana in #14
• Upgrade to php 7.4 by @ijcamiloduque in #16

New Contributors

• @nootanghimire made their first contribution in #9
• @ariskataoka made their first contribution in #11
• @estringana made their first contribution in #14
• @ijcamiloduque made their first contribution in #16

Full Changelog: v1.5.3...v1.5.4

json support

adds a JSON parser

Multi Placeholder Fix

• Multiple placeholders in fixtures fix by @olliebrennan

New Redis Persister

• Redis Persister contributed by @aaronweatherall

Fixing unit tests and minor refactor

• Fixing unit test (Thanks Travis)
• Minor refactor to improve Scrutinizer index

Improving performance for placeholder replacing feature

• Don't iterate over fixture that won't have placeholder substitution. User must specify the name of the fixture in the array passed to the Fixture Manager create method.

Adding Placeholder Replacing Feature

• Now you can put placeholders in the values of your fixtures and they will be replaced with the value you specify programatically when creating the Fixture Manager.
• Minor security validations

Minor fixes

• Making encoding for MySQL connection to be UTF-8

Minor refactoring

• Fixed exception message for duplicated fixtures.
• Moved getConnection() method to concrete Persister class since PDO connection can vary for a driver.