fixed typo

Former-commit-id: 5da50ea190be8a2a1eecce40ae8d3d0590eb0bbd

lib/single-file/modules/html-serializer.js

@@ -99,7 +99,7 @@ this.singlefile.lib.modules.serializer = this.singlefile.lib.modules.serializer
 			}
 			return textNode.textContent;
 		} else {
-			return textNode.textContent.replace(/&/g, "&amp;").replace(/\u00a0/g, "&nbsp;").replace(/</g, "&lt;").replace(/</g, "&gt;");
+			return textNode.textContent.replace(/&/g, "&amp;").replace(/\u00a0/g, "&nbsp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
 		}
 	}