Update readme

README.md

@@ -32,31 +32,15 @@ If this project's helped you, please consider [sponsoring me](https://github.com
 
 As of mail-mime-parser 3.0, support for php 7 has been dropped.
 
-## Removal Notice (since 2.0.0)
+## New in 3.0
 
-`getContentResourceHandle`, `getTextResourceHandle`, and `getHtmlResourceHandle` have all been deprecated in 1.2.1 and removed in 2.0.0. fread() will only return a single byte of a multibyte char, and so will cause potentially unexpected results/warnings in some cases, and psr7 streams should be used instead. Note that `getBinaryContentResourceHandle` and `getResourceHandle` are still available.
+Most changes in 3.0 are 'backend' changes, for example switching to PHP-DI for dependency injection, and basic usage should not be affected.
 
-## Change in 2.0
+The header class method 'getAllParts' includes comment parts in 3.0.
 
-Upgrade to 2.0 to take advantage of the new on-demand parser which parses parts of a message as they're requested.  This means reading only the headers from a larger message is as fast as a smaller message because the whole message is no longer parsed (similarly reading just the content and not a message's large attachments is also much faster.)
+Error, validation, and logging support has been added.
 
-Because of the on-demand parsing, starting in 2.0, the passed resource handle or stream must remain open while the returned message object is still in use.
-
-Old code:
-```php
-$handle = fopen('file.mime', 'r');
-$message = $mailParser->parse($handle);         // returned `Message`
-fclose($handle);
-```
-
-New code:
-```php
-// attaches the resource handle to the returned `IMessage` if the second parameter
-// is true.  The resource handle is closed when the IMessage is destroyed.
-$message = $mailParser->parse(fopen('file.mime', 'r'), true);
-```
-
-For a more complete list of changes, please visit the [2.0 Upgrade Guide](https://mail-mime-parser.org/upgrade-2.0).
+For a more complete list of changes, please visit the [3.0 Upgrade Guide](https://mail-mime-parser.org/upgrade-3.0).
 
 ## Requirements
 
@@ -128,12 +112,13 @@ fclose($handle);
 ## Documentation
 
 * [Usage Guide](https://mail-mime-parser.org/)
-* [API Reference](https://mail-mime-parser.org/api/2.2)
+* [API Reference](https://mail-mime-parser.org/api/3.0)
 
-## Upgrading to 1.x or 2.x
+## Upgrade guides
 
 * [1.x Upgrade Guide](https://mail-mime-parser.org/upgrade-1.0)
 * [2.x Upgrade Guide](https://mail-mime-parser.org/upgrade-2.0)
+* [3.x Upgrade Guide](https://mail-mime-parser.org/upgrade-3.0)
 
 ## License