upgrade packages so that zcache is node12-compatible

Author: Nick Santos

.travis.yml

@@ -2,6 +2,7 @@ language: node_js
 
 node_js:
    - "0.10"
+   - "0.12"
 
 services:
   - memcached

package.json

@@ -18,10 +18,10 @@
     "node-memcache-parser-obvfork": "0.1.1",
     "generic-pool": "2.0.3",
     "kew": "0.5.0-alpha",
-    "redis": "0.8.2",
-    "hiredis": "0.1.16",
+    "redis": "0.12.1",
+    "hiredis": "0.2.0",
     "metrics": "0.1.6",
-    "hashring": "1.0.3",
+    "hashring": "3.1.0",
     "snappy": "3.0.7"
   },
   "devDependencies": {