开源书籍
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* https://github.com/EbookFoundation/free-programming-books
* https://github.com/sindresorhus/awesome
* https://github.com/dariubs/GoBooks
* 《Mastering GO》: https://github.com/hantmac/Mastering_Go_ZH_CN
* 收集: https://github.com/guanpengchn/awesome-books