2019-02-27 (5.7.6) mpetrunic
    * Fix Lumen compatibility issues

2019-02-22 (5.7.5) dstepe
    * Start CHANGELOG
    * Replace use of LARAVEL_START constant with REQUEST_TIME_FLOAT server var
    * Replace transaction duration with PhilKra\Helper\Timer
    * Require philkra/elastic-apm-php-agent >=6.5.3 for Timer feature
