Update Readme to mention submodule update (#56)

See: #53
igrr · Nov 25, 2018 · 2ee9d6c · 2ee9d6c
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diff --git a/README.md b/README.md
@@ -62,6 +62,7 @@ You need gcc (≥4.8) or clang(≥600.0.57), and make. On Windows, use MinGW.
 
 Run:
 ```bash
+$ git submodule update --init
 $ make dist
 ```