Update .travis.yml

Author: carlosbuenosvinos

.travis.yml

@@ -1,10 +1,8 @@
 language: php
 
 php:
-    - 5.4
-    - 5.5
-    - 5.6
-    - hhvm
+    - 7.3
+    - 7.4
 
 before_install:
     - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then echo "extension=amqp.so" >> `php --ini | grep "Loaded Configuration" | sed -e "s|.*:\s*||"`; fi;'
@@ -14,4 +12,4 @@ before_install:
 install:
     - php composer.phar install
 
-script: bin/phpunit
+script: bin/phpunit