Update README.md

Author: yanglbme

.gitignore

@@ -3,7 +3,7 @@
 </p>
 
 <p align="center">
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+  <a href="https://github.com/doocs/leetcode"><img src="https://img.shields.io/badge/lang-Java%2FPython%2FRuby%2FCPP%2FJS%2FGo...-blue.svg" alt="Language"></a>
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