Add Travis-CI integration

Author: davgothic

.travis.yml

@@ -0,0 +1,18 @@
+language: php
+
+php:
+  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
+  - 7.2
+
+cache:
+  timeout: 1800
+  directories:
+    - $HOME/.composer/cache/files
+before_script:
+  - composer install
+
+script:
+  - ./vendor/bin/phpunit

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Client interface to allow custom client implementations
 - Guzzle HTTP client implementation
 - Unit tests
+- Travis-CI integration
 
 ### Changed
 - Moved cURL client implementation out of the SmushIt class