io: add missing dependency

e918007a · Gauthier Quesnel · b2631482 · e918007a
Commit e918007a authored Sep 22, 2020 by Gauthier Quesnel
--- a/lib/include/irritator/io.hpp
+++ b/lib/include/irritator/io.hpp
@@ -10,6 +10,7 @@
 #include <algorithm>
 #include <istream>
 #include <ostream>
+#include <vector>

 namespace irt {