Update README.md

Author: crjeder

README.md

@@ -51,8 +51,8 @@ Power down functions exist just for compatibility. Implementation is not possibl
 - [X] `[no_std]`
 - [X] make it re-entrant / thread safe  
 - [ ] validate against other libraries (bit banging, python, ..) 
-- [ ] async
-- [ ] use emedded HAL v1
+- [X] async
+- [X] use emedded HAL v1
 - [ ] use compile-time dimensional analysis 
 
 ## Examples
@@ -163,4 +163,4 @@ This Source Code Form is subject to the terms of the Mozilla Public License, v.
 
 If it is not possible or desirable to put the notice in a particular file, then You may include the notice in a location (such as a LICENSE file in a relevant directory) where a recipient would be likely to look for such a notice.
 
-You may add additional accurate notices of copyright ownership.
+You may add additional accurate notices of copyright ownership.