Fix broken CI

.travis.yml

@@ -1,5 +1,11 @@
 language: php
 sudo: false
+notifications:
+  email: false
+
+services:
+  - postgresql
+  - mysql
 
 php:
   - 7.1
@@ -29,4 +35,4 @@ before_script:
   - ls -la plugins/
 
 script:
-  - phpunit -c tests/units.$DB.xml plugins/$PLUGIN/Test/
+  - ./vendor/bin/phpunit -c tests/units.$DB.xml plugins/$PLUGIN/Test/