Fix typo

Author: egoist

README.md

@@ -89,7 +89,7 @@ You can also use the [online tool](http://danilowoz.com/create-react-content-loa
 |preserveAspectRatio|string|`'xMidYMid meet'`||
 |primaryColor|string|`'#f9f9f9'`||
 |secondaryColor|string|`'#ecebeb'`||
-|uniquekey|string|`randomId()`|Unique ID, you need to make it consistent for SSR|
+|uniqueKey|string|`randomId()`|Unique ID, you need to make it consistent for SSR|
 |animate|boolean|`true`||
 
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