PHP8 support and updated dependencies

composer.json: we are PHP8-compliant now #42
ImageGD: imagecreatetruecolor returns false on errors #43
Add code coverage #44

Lazy database connection + php-cs-fixer

Bump phpunit/phpunit from 9.5.3 to 9.5.4 #22
Install php-cs-fixer #23
Database - implement lazy connection on the first query #18
Test models #25

Code cleanup and linter introduced

Test with different Redis versions #13
Bump domnikl/statsd from 2.10.0 to 3.0.2 #15
Bump phpunit/phpunit from 9.5.2 to 9.5.3 #16
Remove domnikl/statsd dependency #17
Delete nano.php #19
Introduce phpstan as code linter #21

Bring back tests

Update .gitattributes

Could not scan for classes inside "/home/macbre/src/git/app/vendor/elecena/nano/tests/app/classes/" which does not appear to be a file nor a folder

Initial public release

Supporting PHP 7.2+