Fix build for go 1.9

This change makes the #includes between credentials.go and remote.go
consistent to avoid a build error in go 1.9.

1 files changed, 3 insertions, 1 deletions

diff --git a/remote.go b/remote.go
index b4b1dd7..43ffd33 100644
--- a/remote.go
+++ b/remote.go
@@ -1,9 +1,11 @@
 package git
 
 /*
-#include <git2.h>
 #include <string.h>
 
+#include <git2.h>
+#include <git2/sys/cred.h>
+
 extern void _go_git_setup_callbacks(git_remote_callbacks *callbacks);
 
 */