include: add missing headers

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I6b26a1bea2aae173b57dbd8affa0ba4991b1c9bb
diff --git a/include/sensor.hpp b/include/sensor.hpp
index aad8548..f83a45e 100644
--- a/include/sensor.hpp
+++ b/include/sensor.hpp
@@ -2,7 +2,11 @@
 
 #include "Thresholds.hpp"
 
+#include <limits>
+#include <memory>
 #include <sdbusplus/asio/object_server.hpp>
+#include <string>
+#include <vector>
 
 constexpr size_t sensorFailedPollTimeMs = 5000;