Update readme

Author: mysticmind

README.md

@@ -1,9 +1,18 @@
+<!--
+GENERATED FILE - DO NOT EDIT
+This file was generated by [MarkdownSnippets](https://github.com/SimonCropp/MarkdownSnippets).
+Source File: /README.source.md
+To change this file edit the source file and then run MarkdownSnippets.
+-->
+
 # Meet ReverseMarkdown
 
 [![Windows Build status](https://ci.appveyor.com/api/projects/status/xse0bia9olr5shxr?svg=true)](https://ci.appveyor.com/project/BabuAnnamalai/reversemarkdown-net) [![Windows Build status](https://api.travis-ci.org/mysticmind/reversemarkdown-net.svg)](https://travis-ci.org/mysticmind/reversemarkdown-net) [![NuGet Version](https://badgen.net/nuget/v/reversemarkdown)](https://www.nuget.org/packages/ReverseMarkdown/)
 
 ReverseMarkdown is a Html to Markdown (http://daringfireball.net/projects/markdown/syntax) converter library in C#. Conversion is very reliable since HtmlAgilityPack (HAP) library is used for traversing the Html DOM.
 
+Note that the library implementation is based on the Ruby based Html to Markdown converter [ xijo/reverse_markdown](https://github.com/xijo/reverse_markdown).
+
 ## Usage
 
 Install the package from NuGet using `Install-Package ReverseMarkdown` or clone the repository and built it yourself.
@@ -70,10 +79,11 @@ var converter = new ReverseMarkdown.Converter(config);
   * `UnknownTagsOption.Drop` - Drop the unknown tag and its content
   * `UnknownTagsOption.Bypass` - Ignore the unknown tag but try to convert its content
   * `UnknownTagsOption.Raise` - Raise an error to let you know
+* `PassThroughTags` - Pass a list of tags to pass through as-is without any processing.
 * `WhitelistUriSchemes` - Specify which schemes (without trailing colon) are to be allowed for `<a>` and `<img>` tags. Others will be bypassed (output text or nothing). By default allows everything.
 
   If `string.Empty` provided and when `href` or `src` schema couldn't be determined - whitelists
-  
+
   Schema is determined by `Uri` class, with exception when url begins with `/` (file schema) and `//` (http schema)
 * `TableWithoutHeaderRowHandling` - handle table without header rows
   * `TableWithoutHeaderRowHandlingOption.Default` - First row will be used as header row (default)
@@ -87,9 +97,6 @@ var converter = new ReverseMarkdown.Converter(config);
 * Can deal with nested lists
 * Github Flavoured Markdown conversion supported for br, pre and table. Use `var config = new ReverseMarkdown.Config(githubFlavoured:true);`. By default table will always be converted to Github flavored markdown immaterial of this flag.
 
-## Acknowledgement
-The library implementation is based on the Ruby based Html to Markdown converter [xijo/reverse_markdown](https://github.com/xijo/reverse_markdown).
-
 ## Copyright
 
 Copyright © 2020 Babu Annamalai