Update README.md

Tfly6 · web-flow · commit 8dfc5911a57a · 2022-07-20T12:14:56.000+08:00
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 # CoinFlip （翻金币）
+### based on Qt5.12.3
 This is the learning outcome of a simple Qt practical case, and will continue to improve in spare time (it may never be perfected)  
 这是一个简单的Qt实战案例的学习成果，在空余时间会继续完善（有可能永远不会完善）
