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Update README.md (#19717)

the thumbnail is not related to the link anymore 
https://github.com/flutter/flutter/issues/17380
R
Rahiche committed
cb2b9c30a05aa548214f122dd40bee1c7e1cb778
Parent: 1269863
Committed by Michael Goderbauer <goderbauer@google.com> on 7/25/2018, 9:23:36 PM