(chore) add alpha mention to readme

Author: joshgoebel

CHANGES.md

@@ -2,6 +2,8 @@
 
 **This is a major release.**  As such it contains breaking changes which may require action from users.  Please read [VERSION_11_UPGRADE.md](https://github.com/highlightjs/highlight.js/blob/main/VERSION_11_UPGRADE.md) for a detailed summary of all breaking changes.
 
+### Potentially breaking changes
+
 Unless otherwise attributed items below are thanks to [Josh Goebel][] (ref: [#2558](https://github.com/highlightjs/highlight.js/issues/2558)).
 
 *The below list should only be considered to be a high-level summary.*
@@ -37,10 +39,7 @@ Language Grammars:
 - Some language grammar files have been removed.
 - Some redundant language aliases have been removed.
 
-[Josh Goebel]: https://github.com/joshgoebel
-
-
-## Version next (maybe 10, maybe merged into 11?)
+### Other changes
 
 Parser:
 
@@ -100,6 +99,7 @@ Dev Improvements:
 [NullVoxPopuli]: https://github.com/NullVoxPopuli
 [Mike Watling]: https://github.com/Pickysaurus
 
+
 ## Version 10.7.1
 
 - fix(parser) Resolves issues with TypeScript types [Josh Goebel][]

README.md

@@ -58,10 +58,12 @@ detection.
 
 ---
 
-#### Upgrading to Version 11
+#### Upgrading to Version 11 (currently in alpha)
 
 As always our major releases do contain breaking changes which may require action from users.  Please read [VERSION_11_UPGRADE.md](https://github.com/highlightjs/highlight.js/blob/main/VERSION_11_UPGRADE.md) for a detailed summary of breaking changes and any actions you may need to take.
 
+**Latest:** 11.0.0-alpha0
+
 #### Upgrading to Version 10
 
 Please read [VERSION_10_UPGRADE.md](https://github.com/highlightjs/highlight.js/blob/main/VERSION_10_UPGRADE.md) for  high-level summary of breaking changes and any actions you may need to take. See [VERSION_10_BREAKING_CHANGES.md](https://github.com/highlightjs/highlight.js/blob/main/VERSION_10_BREAKING_CHANGES.md) for a more detailed list and [CHANGES.md](https://github.com/highlightjs/highlight.js/blob/main/CHANGES.md) to learn what else is new.
@@ -70,6 +72,8 @@ Please read [VERSION_10_UPGRADE.md](https://github.com/highlightjs/highlight.js/
 
 Please see [SECURITY.md](https://github.com/highlightjs/highlight.js/blob/main/SECURITY.md) for support information.
 
+---
+
 ## Basic Usage
 ### In the Browser