Update PHP versions

Author: Nyholm

.travis.yml

@@ -7,9 +7,6 @@ cache:
     - $HOME/.composer/cache
 
 php:
-  - 5.5
-  - 5.6
-  - 7.0
   - 7.1
   - 7.2
   - hhvm
@@ -21,10 +18,9 @@ env:
 matrix:
   fast_finish: true
   include:
-    - php: 5.5
+    - php: 7.1
+      name: "Lowest dependencies"
       env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" COVERAGE=true PHPUNIT_FLAGS="--coverage-clover build/coverage.xml"
-  allow_failures:
-    - php: hhvm
 
 before_install:
   - travis_retry composer self-update