Only test supported releases and PHP versions

.travis.yml

@@ -3,19 +3,17 @@
 language: php
 
 php:
-  - 5.3
+  - 5.6
 
 env:
   - DB=MYSQL CORE_RELEASE=3
 
 matrix:
   include:
-    - php: 5.4
-      env: DB=PGSQL CORE_RELEASE=3
-    - php: 5.5
-      env: DB=MYSQL CORE_RELEASE=3.2
     - php: 5.6
-      env: DB=MYSQL CORE_RELEASE=3.2
+      env: DB=PGSQL CORE_RELEASE=3
+    - php: 5.6
+      env: DB=MYSQL CORE_RELEASE=3
 
 before_script:
  - pear -q install --onlyreqdeps pear/PHP_CodeSniffer