Added alternative as an array

README.md

@@ -161,6 +161,12 @@ git diff
 git diff --cached
 ```
 
+
+__Alternatives:__
+```sh
+git diff --staged
+```
+
 ## Show both staged and unstaged changes
 ```sh
 git diff HEAD

tips.json

@@ -25,7 +25,7 @@
 }, {
     "title": "Changes staged for commit",
     "tip": "git diff --cached",
-    "alternatives": "git diff --staged"
+    "alternatives": ["git diff --staged"]
 }, {
     "title": "Show both staged and unstaged changes",
     "tip": "git diff HEAD"