Update PHP versions on Travis

Signed-off-by: Maurício Meneghini Fauth <mauriciofauth@gmail.com>

Author: MauricioFauth

.travis.yml

@@ -3,13 +3,10 @@ dist: trusty
 language: php
 
 php:
-  - "5.5"
-  - "5.6"
-  - "7.0"
-  - "7.1"
-  - "7.2"
-  - "hhvm-3.12"
-  - "hhvm-3.18"
+  - 7.1
+  - 7.2
+  - 7.3
+  - nightly
 
 sudo: false
 
@@ -23,6 +20,6 @@ cache:
   directories:
     - $HOME/.composer/cache
 
-script: 
+script:
   - find PMAStandard/ -name '*.php' -print0 | xargs -0 -n1 php -l
 #  - ./vendor/bin/phpunit --configuration phpunit.xml