Removing pyrus from travis

.travis.yml

@@ -5,15 +5,14 @@ os:
   - windows
 
 php:
-  - 5.3.29
-  - 5.4.45
-  - 5.5.29
-  - 5.6.13
+  - 5.3
+  - 5.4
+  - 5.5
+  - 5.6
 
 before_script:
   - composer self-update
   - composer install
-  - pyrus install pear/PHP_CodeSniffer
   - phpenv rehash
 
 script: