修订Chapter4格式问题

Chapter4/README.md

@@ -7,16 +7,10 @@
 - [4.1](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
 - [4.2](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
 - [4.3](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
-- [4.4](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
 - [4.5](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
 - [4.6](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
 
 ### 4.3 剪支处理
 ### 4.4 连续与缺失值
-- [4.7](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
-- [4.8](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
-- [4.9](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
-- [4.10](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
-- [4.11](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
-- [4.12](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
+- [4.7-4.8](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/chapter4.md)
 ### 4.5 多变量决策树

README.md

@@ -13,13 +13,13 @@
 
 ## 目录
 
-- 第1章 [绪论](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter1/README.md)
-- 第2章 [模型评估与选择](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter2/README.md)
-- 第3章 [线性模型](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter3/README.md)
-- 第4章 [决策树](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4/README.md)
-- 第5章 [神经网络](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter5/README.md)
-- 第6章 todo
-- 第7章 [贝叶斯分类器](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter7/README.md)
+- 第1章 [绪论](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter1)
+- 第2章 [模型评估与选择](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter2)
+- 第3章 [线性模型](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter3)
+- 第4章 [决策树](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter4)
+- 第5章 [神经网络](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter5)
+- 第6章 [支持向量机](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter6)
+- 第7章 [贝叶斯分类器](https://github.com/Datawhale18/pumpkin-book/blob/master/Chapter7)
 
 ## 在线阅读须知