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/frc971/control_loops/hall_effect_tracker.h b/frc971/control_loops/hall_effect_tracker.h
index 084c9a7..c18d2af 100644
--- a/frc971/control_loops/hall_effect_tracker.h
+++ b/frc971/control_loops/hall_effect_tracker.h
@@ -1,7 +1,7 @@
 #ifndef FRC971_CONTROL_LOOPS_HALL_EFFECT_H_
 #define FRC971_CONTROL_LOOPS_HALL_EFFECT_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "frc971/control_loops/control_loops_generated.h"