travis php version updated

.travis.yml

@@ -1,13 +1,13 @@
 language: php
 sudo: false
 php:
-  - 7.2
+  - 7.4
 before_script:
   - composer install -n
 script:
   - vendor/bin/codecept run unit --coverage --coverage-xml
 after_script:
-  - if [ $TRAVIS_PHP_VERSION = '7.2' ]; then php vendor/bin/php-coveralls; fi
+  - if [ $TRAVIS_PHP_VERSION = '7.4' ]; then php vendor/bin/php-coveralls; fi
 after_success:
   - travis_retry php vendor/bin/php-coveralls -v
   - vendor/bin/test-reporter