Update README.md

Alkenso · Jul 25, 2019 · 2c79b9c · 2c79b9c
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diff --git a/README.md b/README.md
@@ -19,6 +19,7 @@ asenum combines Enum and Variant: it allows to create lighweight wrapper around
 
 #include <string>
 #include <chrono>
+#include <iostream>
 
 enum class ErrorCode
 {