use native .reverse if available

Author: rubensayshi

index.js

@@ -1,10 +1,14 @@
 module.exports = function reverse (src) {
   var buffer = new Buffer(src.length)
 
-  for (var i = 0, j = src.length - 1; i <= j; ++i, --j) {
-    buffer[i] = src[j]
-    buffer[j] = src[i]
-  }
+  if (typeof buffer.reverse === "function") {
+    return buffer.reverse()
+  } else {
+    for (var i = 0, j = src.length - 1; i <= j; ++i, --j) {
+        buffer[i] = src[j]
+        buffer[j] = src[i]
+    }
 
-  return buffer
+    return buffer
+  }
 }