Add ability to set custom config modifiers

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#45

[what-the-diff[bot]]

PR Summary

• Version Update

  • The version number has been updated to 2.1.0 for better tracking of build and release cycles.

• Enhanced Customization Capability

  • Added a new feature that allows users to set their own configuration modifiers, enhancing the flexibility of the system. Affected files include src/ApplicationRunner.php, tests/ApplicationRunnerTest.php, tests/Support/ApplicationRunner/ApplicationRunner.php.

• Testing Capability Extended

  • Extended the test suite with a new method named testConfigModifiers(). This will verify the proper functioning of the newly added ability to set custom config modifiers.

• Addition of Custom Configuration Files

  • Added two new files ('custom.php' and 'custom2.php') within a group named 'custom'. These files provide the capability for users to customize their configurations for the system.

• Addition to Changelog

  • In the 'CHANGELOG.md' file, an item about the new ability to set custom config modifiers has been added. This records our changes and enhancements for tracking purposes.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (268f7b8) 100.00% compared to head (f968e6d) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #54 +/- ## =========================================== Coverage 100.00% 100.00% Complexity 23 23 =========================================== Files 2 2 Lines 70 71 +1 =========================================== + Hits 70 71 +1 ```

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[samdark]

👍