Merge pull request #110 from clue-labs/travis

Lock Travis distro so new defaults will not break the build

.travis.yml

@@ -1,22 +1,28 @@
 language: php
 
 php:
-  - 5.3
+# - 5.3 # requires old distro, see below
   - 5.4
   - 5.5
   - 5.6
   - 7.0
   - 7.1
-  - nightly
-  - hhvm
+  - nightly # ignore errors, see below
+  - hhvm # ignore errors, see below
+
+# lock distro so new future defaults will not break the build
+dist: trusty
 
 matrix:
+  include:
+    - php: 5.3
+      dist: precise
   allow_failures:
     - php: nightly
     - php: hhvm
 
 install:
-  - composer install --prefer-source
+  - composer install --no-interaction
 
 script:
   - vendor/bin/phpunit --coverage-text