Updated benchmark PHP version from 5.6 to 7.4

Author: divineniiquaye

.travis.yml

@@ -1,12 +1,13 @@
 language: php
 
 php:
-  - 5.6
+  - 7.4
 
 sudo: false
 
 before_script:
   - composer install
 
 script: 
-  - php vendor/bin/phpbench run --report=all
+  - php vendor/bin/phpbench run --report=all --progress=travis
+  - php vendor/bin/phpbench run --report=all --output=html