Update README.md

update the way to update git submodule
RunningXie · Aug 14, 2021 · 7414729 · 7414729
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diff --git 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
 ```