Test lowest and latest deps

Author: snapshotpl

.travis.yml

@@ -1,17 +1,20 @@
 language: php
 
-matrix:
-  fast_finish: true
-  include:
-    - php: 5.5
-    - php: 5.6
-    - php: 7
-    - php: 7.1
-    - php: hhvm
+php:
+  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
+  - hhvm
 
-install:
-  - travis_retry composer install --no-interaction --prefer-source
-  - composer info -i
+env:
+  - DEPS=lowest
+  - DEPS=latest
+
+before_script:
+  - composer self-update
+  - if [[ $DEPS == 'lowest' ]]; then travis_retry composer update --prefer-lowest --prefer-stable --no-interaction ; fi
+  - travis_retry composer install --no-interaction
 
 script:
   - ./vendor/bin/phpunit