Change travis tests

Author: terox

.travis.yml

@@ -2,19 +2,15 @@ language: php
 sudo: false
 
 php:
-  - 5.5
-  - 5.6
   - 7.0
-  - hhvm
+  - 7.1
 
 cache:
   directories:
     - $HOME/.composer/cache
 
 matrix:
   fast_finish: true
-  allow_failures:
-    - php: hhvm
 
 before_install:
   - composer selfupdate
@@ -31,9 +27,6 @@ install:
   - if [ "$DEPENDENCIES" == "low" ]; then composer update --prefer-lowest; fi;
   - composer require ramsey/uuid
 
-before_script:
-  - echo "<?php if (PHP_VERSION_ID >= 50400) echo ',@php5.4';" > php_version_tags.php
-
 script:
    - bin/phpspec run --format=pretty
    #- ./vendor/bin/phpunit --testdox