Drop HHVM and support PHP 7

Author: GrahamCampbell

.travis.yml

@@ -1,32 +1,26 @@
 language: php
-php:
-  - 5.3.3
-  - 5.3
-  - 5.4
-  - 5.5
-  - 5.6
-  - hhvm
-  - hhvm-nightly
 
 matrix:
-    allow_failures:
-        - php: hhvm
-        - php: hhvm-nightly
+  include:
+    - php: 5.3
+      dist: precise
+    - php: 5.4
+      dist: trusty
+    - php: 5.5
+      dist: trusty
+    - php: 5.6
+      dist: xenial
+    - php: 7.0
+      dist: xenial
+    - php: 7.1
+      dist: bionic
+    - php: 7.2
+      dist: bionic
+    - php: 7.3
+      dist: bionic
+    - php: 7.4
+      dist: bionic
 
-script:
- - vendor/bin/phpunit
+before_script: travis_retry composer install
 
-before_script:
- - sudo apt-get -qq update > /dev/null
- - phpenv rehash > /dev/null
- - composer selfupdate --quiet
- - composer install --no-interaction --prefer-source --dev
- - vendor/bin/phpunit
- - composer update --no-interaction --prefer-source --dev
-
-notifications:
-  irc: "irc.freenode.org#phpdocumentor"
-  email:
-    - mike.vanriel@naenius.com
-    - ashnazg@php.net
-    - boen.robot@gmail.com
+script: vendor/bin/phpunit