Update README.md

Author: nopara73

README.md

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 [The book on GitHub](https://github.com/ProgrammingBlockchain/ProgrammingBlockchain)  
 [The book on GitBook](https://www.gitbook.com/book/programmingblockchain/programmingblockchain) (You can download pdf, epub, mobi versions here.)  
-[Code examples on GitHub](https://github.com/ProgrammingBlockchain/ProgrammingBlockchainCodeExamples/)
+[Code examples on GitHub](https://github.com/ProgrammingBlockchain/ProgrammingBlockchainCodeExamples/)  
 [Hall of the Makers](http://n.bitcoin.ninja/) (Here are the true makers those succeeded to complete the challenges of this book.)