Update README.md

README.md

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 | &emsp;&emsp;&emsp;Java&emsp;&emsp;&emsp;<br>[:coffee:](#coffee-java) | &emsp;&emsp;&emsp;系统设计&emsp;&emsp;&emsp;<br>[:bulb:](#bulb-系统设计) | &emsp;&emsp;&emsp;&emsp;工具&emsp;&emsp;&emsp;&emsp;<br>[:hammer:](#hammer-工具) | &emsp;&emsp;&emsp;编码实践&emsp;&emsp;&emsp;<br>[:speak_no_evil:](#speak_no_evil-编码实践) | &emsp;&emsp;&emsp;后记 &emsp;&emsp;&emsp;<br>[:memo:](#memo-后记) |
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-[🎁 面试专栏限时优惠，从零开始冲刺大厂面试](https://xiaozhuanlan.com/CyC2018)
+[🎁 面试专栏限时优惠，更能加入知识星球](https://xiaozhuanlan.com/CyC2018)
 
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