Run on new travis infrastructure, and on php 7.0 too

Author: GrahamCampbell

.travis.yml

@@ -6,11 +6,13 @@ php:
   - 5.4
   - 5.5
   - 5.6
+  - 7.0
   - hhvm
 
-before_script:
-  - travis_retry composer self-update
-  - travis_retry composer install --no-interaction --prefer-source --dev
+sudo: false
+
+install:
+  - travis_retry composer install --no-interaction --prefer-source
 
 script:
   - vendor/bin/phpunit --verbose --coverage-text