feat(package): upgrade html-minifier to 3.5.20

Author: joshuawilson

package.json

@@ -141,7 +141,7 @@
     "gulp-string-replace": "1.1.1",
     "gulp-stylelint": "7.0.0",
     "html-loader": "0.5.5",
-    "html-minifier": "3.5.19",
+    "html-minifier": "3.5.20",
     "html-webpack-plugin": "3.2.0",
     "htmlhint-loader": "1.3.1",
     "husky": "0.14.3",