Rename key.h to key-locator.h. Refs #1089.
diff --git a/src/c/data.h b/src/c/data.h
index 68ed6ed..4750ae9 100644
--- a/src/c/data.h
+++ b/src/c/data.h
@@ -10,7 +10,7 @@
 #include <ndn-cpp/c/data-types.h>
 #include "name.h"
 #include "publisher-public-key-digest.h"
-#include "key.h"
+#include "key-locator.h"
 
 #ifdef __cplusplus
 extern "C" {