Update README.md

README.md

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 <li>slave重做中继日志中的事件，将改变反映它自己的数据。</li>
 </ol>
 <h3>canal的工作原理：</h3>
-<p><img width="590" src="http://dl.iteye.com/upload/attachment/0080/3107/c87b67ba-394c-3086-9577-9db05be04c95.jpg" alt="" height="273">
+<p><img width="590" src="https://camo.githubusercontent.com/46c626b4cde399db43b2634a7911a04aecf273a0/687474703a2f2f646c2e69746579652e636f6d2f75706c6f61642f6174746163686d656e742f303038302f333130372f63383762363762612d333934632d333038362d393537372d3964623035626530346339352e6a7067" alt="" height="273">
 <p>原理相对比较简单：</p>
 <ol>
 <li>canal模拟mysql slave的交互协议，伪装自己为mysql slave，向mysql master发送dump协议</li>