Attempt to fix hhvm tests

.gitlab-ci.yml

@@ -32,7 +32,7 @@ test:hhvm:
       - /usr/local/bin/composer self-update
       - curl -Lo /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar
       - chmod +x /usr/local/bin/phpunit
-      - composer install --no-dev
+      - composer install --no-dev --ignore-platform-reqs
     image: 51systems/docker-gitlab-ci-runner-hhvm
     script:
       - hhvm -d hhvm.php7.all=true /usr/local/bin/phpunit -c build --coverage-text --colors=never

.travis.yml

@@ -1,10 +1,11 @@
 language: php
 
 install:
-  - composer install
+  - composer install --ignore-platform-reqs
 
 php:
   - 7
+  - 7.1
   - hhvm
   - nightly