Added cache.random() and node engine to package.json

lib/Util/Cache.js

@@ -83,6 +83,10 @@ var Cache = (function (_Array) {
 		}
 	};
 
+	Cache.prototype.random = function random() {
+		return this[Math.floor(Math.random() * this.length)];
+	};
+
 	Cache.prototype.remove = function remove(data) {
 		var index = this.indexOf(data);
 		if (~index) {

package.json

@@ -37,5 +37,8 @@
     },
     "optionalDependencies": {
         "node-opus": "^0.1.11"
+    },
+    "engines": {
+        "node": ">=0.12.7"
     }
 }

src/Util/Cache.js

@@ -62,6 +62,10 @@ class Cache extends Array {
 		}
 	}
 	
+	random() {
+		return this[Math.floor(Math.random()*this.length)];
+	}
+
 	remove(data) {
 		var index = this.indexOf(data);
 		if (~index) {