updated readme.md (flutter#84525)

Author: Kalidas VijayBhak

README.md

@@ -65,7 +65,7 @@ regardless of your target platform. And accessing other native code is easy,
 with support for both [FFI] and [platform-specific APIs][platform channels].
 
 Flutter is a fully open-source project, and we welcome contributions.
-Information on how to get started can be found at our
+Information on how to get started can be found in our
 [contributor guide](CONTRIBUTING.md).
 
 [Flutter logo]: https://raw.githubusercontent.com/flutter/website/master/src/_assets/image/flutter-lockup-bg.jpg