Update travis.

Signed-off-by: crynobone <crynobone@gmail.com>

.travis.yml

@@ -1,15 +1,15 @@
 language: php
 
-php: 
+php:
   - 5.3
   - 5.4
   - 5.5
   - 5.6
   - hhvm
 
 before_script:
-  - composer self-update
-  - composer require satooshi/php-coveralls:~0.6 --prefer-source --no-interaction --dev
+  - travis_retry composer self-update
+  - travis_retry composer require satooshi/php-coveralls:~0.6 --prefer-source --no-interaction --dev
 
 script: phpunit -c phpunit.xml --coverage-text
 
@@ -18,6 +18,5 @@ after_script:
 
 matrix:
   allow_failures:
-    - php: 5.6
     - php: hhvm
   fash_finish: true