Update README.md

update the way to update git submodule

Update README.md
update the way to update git submodule
7414729b · Zongzhi Chen · GitHub · ee64c8d4 · 7414729b
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README.md README.md +3 -0

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--- a/README.md
+++ b/README.md
@@ -79,6 +79,9 @@ Get the source code

 ```
 git clone https://github.com/Qihoo360/pika.git
+
+git submodule init
+git submodule update
 ```