Wrap label value with dot.Literal

Semantics of Attr changed so that quotes were being added around the
string passed as val. Need to wrap the string with dot.Literal to treat
the string as literal. =.=

pkg/draw/dot.go

@@ -17,8 +17,9 @@ func ERD(tables []models.TableAndColumns, fks []models.ForeignKey) (dot.Graph, e
 		}
 		n := g.Node(table.Name).Box()
 		n.Attr("shape", "plaintext")
-		n.Attr("label", fmt.Sprintf(`<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0"><TR><TD colspan="2">%s</TD></TR>%s</TABLE>>`,
-			table.Name, cols))
+		n.Attr("label", dot.Literal(
+			fmt.Sprintf(`<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0"><TR><TD colspan="2">%s</TD></TR>%s</TABLE>>`,
+				table.Name, cols)))
 		tableToNode[table.Name] = n
 	}