Update README.md

timGRK · Jul 5, 2018 · 958c68b · 958c68b
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 ### 1. :coffee: [Java](#coffee-Java)
 ### 2. :open_file_folder: [数据结构与算法](#open_file_folder-数据结构与算法)
 ### 3. :computer: [计算机网络与数据通信](#computer-计算机网络与数据通信)
-### 4. :computer: [操作系统](#iphone-操作系统)
+### 4. :iphone: [操作系统](#iphone-操作系统)
 ### 5. :pencil2: [主流框架](#pencil2-主流框架)
 ### 6. :floppy_disk: [数据存储](#floppy_disk-数据存储)
 ### 7. :punch: [架构](#punch-架构)