Use PHP 7.4 for phpstan analysis

Signed-off-by: William Desportes <[email protected]>

Author: williamdes

.travis.yml

@@ -18,7 +18,7 @@ matrix:
       script: vendor/bin/phpcs
       before_install: phpenv config-rm xdebug.ini
       after_success: skip
-    - php: 7.1
+    - php: 7.4
       name: "PHPStan"
       script: vendor/bin/phpstan analyze
       before_install: phpenv config-rm xdebug.ini