V3 allow5.6 (thephpleague#200)

* Allow 5.6

* Set lowest

* Remove listener

Author: barryvdh

.travis.yml

@@ -1,6 +1,8 @@
 language: php
 
 php:
+  - 5.6
+  - 7.0
   - 7.1
   - 7.2
 
@@ -10,7 +12,7 @@ env:
 
 matrix:
   include:
-    - php: 7.1
+    - php: 5.6
       env: setup=lowest
 
 sudo: false

phpunit.xml.dist

@@ -14,9 +14,6 @@
             <directory>./tests/</directory>
         </testsuite>
     </testsuites>
-    <listeners>
-        <listener class="Mockery\Adapter\Phpunit\TestListener" file="vendor/mockery/mockery/library/Mockery/Adapter/Phpunit/TestListener.php" />
-    </listeners>
     <filter>
         <whitelist>
             <directory>./src</directory>