README.md: Mention valgrind as optional dependency.

ampotos · Feb 14, 2012 · 09447ef · 09447ef
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diff --git a/README.md b/README.md
@@ -17,6 +17,7 @@ Requirements
 ------------
 
  * Radare2 installed (and in $PATH or set the R2 environment).
+ * Valgrind (optional).
 
 Usage
 -----