remove unused hiredis from dependencies

Author: Sidhu Alluri

package.json

@@ -1,7 +1,7 @@
 {
   "name": "zcache",
   "description": "AWS zone-aware multi-layer cache",
-  "version": "0.6.1",
+  "version": "0.6.2",
   "homepage": "https://github.com/Medium/zcache",
   "authors": [
     "Jeremy Stanley <[email protected]> (https://github.com/azulus)",
@@ -23,7 +23,6 @@
     "generic-pool": "2.0.3",
     "kew": "0.7.0",
     "redis": "0.12.1",
-    "hiredis": "0.4.1",
     "metrics": "0.1.6",
     "hashring": "3.2.0",
     "snappy": "6.3.5"