Update .travis.yml

.travis.yml

@@ -1,47 +1,30 @@
 # Required to run your project under the correct environment.
-
 language: php
 
 # Versions of PHP you want your project run with.
-
 php:
+  - 5.4
+  - 5.5
+  - 5.6
+  - hhvm
 
- - 5.5
-
- - 5.6
-
- - 7.0
-
- - 7.1
-
- - 7.2
-
- - hhvm
-
-
+# Commands to be run before your environment runs.
+before_script:
+  - composer self-update
+  - composer install --prefer-source --no-interaction --dev
 
 # Commands you want to run that will verify your build.
-
 script: phpunit
 
 # allow_failures: Allow this build to fail under the specified environments.
-
 # fast_finish: If your build fails do not continue trying to build, just stop.
-
 matrix:
-
- allow_failures:
-
-   - php: 5.6
-
-   - php: hhvm
-
- fast_finish: true
-
-
-# Project language
-language: php
-
-# Allows use container-based infrastructure
-sudo: false
-
+  allow_failures:
+    - php: 5.6
+    - php: hhvm
+  fast_finish: true
+
+# Customize when the notification emails are sent.
+notifications:
+    on_success: never
+    on_failure: always