Update README.md

README.md

@@ -44,6 +44,7 @@ Add the dependency
 The class required you to implement two callback functions, `onError(error: String)` and `onPostResponse(openGraphResult: OpenGraphResult)`. The former is invoked in case of error (incorrect url), and the latter is invoked on successful response. 
 
 The `showNullOnEmpty` is an optional parameter, with a default value of `false`. If set to `true`, the parser would invoke `onError` if the `title` and `description` are empty for the link provided.
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 The `context` is also an optional parameter. If context is provided, then caching is implemented, and link preview can be generated faster.
 
 The data class ***OpenGraphResult*** contains: