Travis CI config

.travis.yml

@@ -0,0 +1,27 @@
+language: php
+
+env:
+  global:
+  - setup=stable
+
+matrix:
+  fast_finish: true
+  include:
+  - php: 7.1
+  - php: 7.1
+    env: setup=lowest
+  - php: 7.2
+  - php: 7.2
+    env: setup=lowest
+
+sudo: false
+
+cache:
+  directories:
+  - $HOME/.composer/cache
+
+install:
+- if [[ $setup = 'stable' ]]; then travis_retry composer update --prefer-dist --no-interaction --prefer-stable --no-suggest; fi
+- if [[ $setup = 'lowest' ]]; then travis_retry composer update --prefer-dist --no-interaction --prefer-lowest --prefer-stable --no-suggest; fi
+
+script: vendor/bin/phpunit