Add go dependencies for mdtoc

vendor/github.com/mmarkdown/mmark/mast/bibliography.go

@@ -0,0 +1,23 @@
+package mast
+
+import (
+	"github.com/gomarkdown/markdown/ast"
+	"github.com/mmarkdown/mmark/mast/reference"
+)
+
+// Bibliography represents markdown bibliography node.
+type Bibliography struct {
+	ast.Container
+
+	Type ast.CitationTypes
+}
+
+// BibliographyItem contains a single bibliography item.
+type BibliographyItem struct {
+	ast.Leaf
+
+	Anchor []byte
+	Type   ast.CitationTypes
+
+	Reference *reference.Reference // parsed reference XML
+}