Looks like String.h doesn't include string_view.h, maybe this will fix travis ci build?

jimmyjxiao · jimmyjxiao · commit e0e3a221a0ce · 2018-06-15T15:52:03.000-06:00
diff --git a/hdr/sqlite_modern_cpp/type_wrapper.h b/hdr/sqlite_modern_cpp/type_wrapper.h
@@ -5,6 +5,7 @@
 #include <memory>
 #include <vector>
 #ifdef __cplusplus >= 201703 && __has_include(<string_view>)
+#include <string_view>
 #define STR_REF std::string_view
 #define U16STR_REF std::u16string_view
 #else
