Fix html minifier import

Gulpfile.js

@@ -20,7 +20,7 @@ import postcss from "gulp-postcss";
 import cssnano from "cssnano";
 import inline_svg from "postcss-inline-svg";
 import gulpEslint from "gulp-eslint-new";
-import html_minifier from "html-minifier";
+import { minify as html_minifier } from "html-minifier";
 
 import express from "express";
 import body_parser from "body-parser";
@@ -196,7 +196,7 @@ function dev_server(done) {
  dev_server.use(body_parser.json());
  dev_server.use(body_parser.text());
 
- http.createServer(dev_server).listen(port, null, function() {
+ http.createServer(dev_server).listen(port, null, function () {
  console.info(`\n\n#############################################`);
  console.info(`## Development server started on port ${port}`);
  console.info(`## ( http://localhost:${port} )`);
@@ -226,13 +226,13 @@ function dev_server(done) {
  let backend_proxy = (prefix) =>
  proxy_wrapper(server_url, {
  https: use_https,
- proxyReqPathResolver: function(req) {
+ proxyReqPathResolver: function (req) {
  let path = prefix + url.parse(req.url).path;
  console.log("-->", path);
  return path;
  },
- proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
- return new Promise(function(resolve, reject) {
+ proxyReqOptDecorator: function (proxyReqOpts, srcReq) {
+ return new Promise(function (resolve, reject) {
  if (!("Content-Type" in srcReq.headers)) {
  proxyReqOpts.headers["Content-Type"] = "application/json";
  }
@@ -487,7 +487,7 @@ function getPreferredLanguage(req, supported_languages) {
  return lang;
  }
  }
- } catch (e) { }
+ } catch (e) {}
 
  return "en";
 }