Adding Travis integration

Author: Sam-Burns

.travis.yml

@@ -0,0 +1,26 @@
+language: php
+
+sudo: false
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
+matrix:
+  include:
+    - php: 7.1
+      env: DEPENDENCIES='low'
+    - php: 5.6
+    - php: 7.0
+    - php: 7.1
+    - php: nightly
+  allow_failures:
+    - php: nightly
+  fast_finish: true
+
+install:
+  - if [ "$DEPENDENCIES" != "low" ]; then composer update; fi;
+  - if [ "$DEPENDENCIES" == "low" ]; then composer update --prefer-lowest; fi;
+
+script:
+   - ./vendor/bin/phpunit