Update predis to version 1.x.

Author: Spencer Rinehart

composer.json

@@ -14,7 +14,7 @@
         "php": ">=5.3.2"
     },
     "require-dev": {
-        "predis/predis": "~0.8.4",
+        "predis/predis": "~1.0",
         "phpunit/phpunit": "~4.0",
         "squizlabs/php_codesniffer": "~1.5"
     },