Add horizontal line using '---'

formatter/html/html.go

@@ -256,6 +256,9 @@ func (h *HTMLFormatter) Format() string {
 		} else if entry.Break != nil {
 			// Write break tag to output
 			h.out.WriteString("<br>")
+		} else if entry.Hline != nil {
+			// Write horizonhal line tag to output
+			h.out.WriteString("<hr>")
 		}
 	}