Add missing includes

According to include-what-you-use, anyway.  Most of these seem
questionable/unnecessary, but since the whole point here is to avoid wasting
time doing manually what machines can do, just do what the tool says to keep
the checks clean even if it's suboptimal.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/Configuration.hpp b/src/Configuration.hpp
index a92d4af..4afbc4d 100644
--- a/src/Configuration.hpp
+++ b/src/Configuration.hpp
@@ -13,6 +13,7 @@
 #include <optional>
 #include <string>
 #include <tuple>
+#include <variant>
 
 namespace patchage {