Add `Repository.CreateCommitBuffer` (#781)

This commit adds the Go binding for `git_commit_create_buffer`. This
will be used to support the 1.2.0 commit create callback.

1 files changed, 8 insertions, 0 deletions

diff --git a/commit.go b/commit.go
index 1c546b3..3a07fa8 100644
--- a/commit.go
+++ b/commit.go
@@ -12,6 +12,14 @@ import (
 	"unsafe"
 )
 
+// MessageEncoding is the encoding of commit messages.
+type MessageEncoding string
+
+const (
+	// MessageEncodingUTF8 is the default message encoding.
+	MessageEncodingUTF8 MessageEncoding = "UTF-8"
+)
+
 // Commit
 type Commit struct {
 	Object