Update 08.0.md

B* b = new B; will output B no matter "virtual" is added or not.
add chapter01 cpp code and improve readability
Merge pull request #1 from julycoding/master

同步作者的更新
Add chapter 32~33
fix 32~33 error
Update preface.md
Merge pull request #53 from liuyongkang/master

Add chapter 32~33
Merge pull request #52 from Boshen/master

add chapter 1 cpp code and improve readability
Merge pull request #49 from vv1133/patch-1

Update 08.0.md（暂不merge）
Merge pull request #7 from julycoding/master

Merge master code to my own repo