Update ui_widget.hpp

Added include of <functional> to allow for a clean build with g++ 7.2.1 20170904
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RndmNmbr 2018-02-03 13:41:40 -05:00 committed by GitHub
parent 1eb6f10fa6
commit 36e5682406
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@ -32,6 +32,7 @@
#include <memory>
#include <vector>
#include <string>
#include <functional>
namespace ui {