Documentation typo fix. Closes hapijs#2601.

reedog117 · reedog117 · commit 022cbebd78a6 · 2015-06-16T17:14:40.000-04:00
diff --git a/API.md b/API.md
@@ -874,7 +874,7 @@ exports.register = function (server, options, next) {
 register.attributes = {
     name: 'test',
     version: '1.0.0',
-    dependency: 'yar'
+    dependencies: 'yar'
 };
 ```
 
