git clone with .git folder ?

why i git clone the .git folder? I am not clearly, just let .git folder become small. if you konw the reasons,please tell me at issue.
dannymas · May 5, 2017 · 082814e · 082814e
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diff --git a/README.md b/README.md
@@ -39,7 +39,7 @@ A: A useful and better password-generator that helps plenty of penetration teste
 
 ## Start:
 ```
-git clone https://www.github.com/landgrey/pydictor.git
+git clone --depth=1 --branch=master https://www.github.com/landgrey/pydictor.git
 cd pydictor/
 chmod 755 pydictor.py
 python pydictor.py

diff --git a/README_CN.md b/README_CN.md
@@ -33,12 +33,12 @@ A: 1.生成密码它总会帮到你
      不管你是使用的python 2.7版本还是python 3.4 以上版本，pydictor都可以在Windows、Linux 或者是Mac上运行；
 
 Q: pydictor的目标是什么?
-A: 一个实用、帮助大量渗透测试人员更好的工作的更好的密码字典生成器。
+A: 一个实用、帮助大量渗透测试人员更好的工作的更好的密码字典生成器
 ```
 
 ## 开始:
 ```
-git clone https://www.github.com/landgrey/pydictor.git
+git clone --depth=1 --branch=master https://www.github.com/landgrey/pydictor.git
 cd pydictor/
 chmod 755 pydictor.py
 python pydictor.py