Added run CI with PHP 7.4

Author: grogy

.travis.yml

@@ -11,6 +11,7 @@ matrix:
     - php: 7.1
     - php: 7.2
     - php: 7.3
+    - php: 7.4
 
 sudo: false
 

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Added check for Symfony dump function `dd` from [@antograssiot](https://github.com/antograssiot).
 - Added check for Laravel dump function `dump` from [@Douglasdc3](https://github.com/Douglasdc3).
 - Added changelog.
+- Added support for PHP 7.4.
 
 ### Internal