Replace use of deprecated C Standard library headers in C++ code.

Change-Id: I9fa6630c7e4bdb2897df34d417635d8c7d8253bc
Signed-off-by: Tyler Chatow <tchatow@gmail.com>
diff --git a/y2014/constants.h b/y2014/constants.h
index 4ce3714..aa4ac26 100644
--- a/y2014/constants.h
+++ b/y2014/constants.h
@@ -1,7 +1,7 @@
 #ifndef Y2014_CONSTANTS_H_
 #define Y2014_CONSTANTS_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "frc971/control_loops/state_feedback_loop.h"
 #include "frc971/shifter_hall_effect.h"