don't test against php 5.3, 5.4, 5.5. don't allow failures on php7 and hhvm

Author: chrisboulton

.travis.yml

@@ -1,20 +1,11 @@
 language: php
 php:
-  - 5.3
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
   - hhvm
-  
-matrix:
-    allow_failures:
-        - php: hhvm
-        - php: 7.0
 env:
   - REDIS_STANDALONE=0
   - REDIS_STANDALONE=1
-  
 before_script:
   - sh -c "if [ $REDIS_STANDALONE -eq 0 ]; then wget https://github.com/nicolasff/phpredis/archive/2.2.3.zip -O php-redis.zip && unzip php-redis.zip; fi"
   - sh -c "if [ $REDIS_STANDALONE -eq 0 ]; then cd phpredis-2.2.3/ && phpize && ./configure && make && make install; fi"