Fixed minimum dependencies version

Author: Yann Eugoné

.travis.yml

@@ -7,15 +7,10 @@ php:
   - hhvm
   - nightly
 
-matrix:
-  fast_finish: true
-  include:
-    - php: 5.6
-      env: SYMFONY_VERSION=2.7.*
-    - php: 5.6
-      env: SYMFONY_VERSION=2.8.*@dev
-    - php: 5.6
-      env: SYMFONY_VERSION="3.0.x-dev as 2.8"
+env:
+    - SYMFONY_VERSION=2.7.*
+    - SYMFONY_VERSION=2.8.*@dev
+    - SYMFONY_VERSION="3.0.x-dev as 2.8"
 
 sudo: false