Use newer PHPUnit

Jacob Middag · Jacob Middag · commit 8d72813b2aa4 · 2015-05-18T10:48:28.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,7 +6,7 @@ php:
 - 5.6
 - hhvm
 before_script: composer install
-script: phpunit --process-isolation test/unit
+script: bin/unit-tests
 notifications:
   slack:
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