testing all PHPUnit branches

Author: malkusch

.travis.yml

@@ -8,6 +8,8 @@ cache:
 
 env:
   - PHPUNIT_VERSION=dev-master
+  - PHPUNIT_VERSION=~5.2.0-dev
+  - PHPUNIT_VERSION=~5.1.0-dev
   - PHPUNIT_VERSION=~5.0.0
   - PHPUNIT_VERSION=~4.8.0
   - PHPUNIT_VERSION=~4.7.0
@@ -33,6 +35,10 @@ matrix:
   exclude:
     - env: PHPUNIT_VERSION=~5.0.0
       php: 5.5
+    - env: PHPUNIT_VERSION=~5.1.0-dev
+      php: 5.5
+    - env: PHPUNIT_VERSION=~5.2.0-dev
+      php: 5.5
     - env: PHPUNIT_VERSION=dev-master
       php: 5.5
     - env: PHPUNIT_VERSION=dev-master