README.md: Update as per the rename to meta-python-mixin

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

README.md

-# meta-python-extra
+# meta-python-mixin
 
 ## Introduction
 
 This layer is intended to be an extension to the meta-python layer. It
-(meta-python-extra) will provide additional modules, versions or various other
+(meta-python-mixin) will provide additional modules, versions or various other
 functionality backported from meta-python later branches. It does that by
 maintaining equivalent LTS branches (e.g. dunfell) where this support is
 maintained.
@@ -13,7 +13,7 @@ other layers. For example, meta-homeassistant.
 
 ## Dependencies
 
-The meta-python-extra layer depends on:
+The meta-python-mixin layer depends on:
 
 * URI: git://git.openembedded.org/openembedded-core
   * layers: meta
@@ -30,7 +30,7 @@ Please follow the recommended setup procedures of your OE distribution.
 
 Contributions to this layer are to be handled as merge requests in the Gitlab
 instance where the layer is hosted:
-https://git.ostc-eu.org/OSTC/OHOS/meta-python-extra.
+https://git.ostc-eu.org/OSTC/ASOS/meta-python-mixin.
 
 ## Maintenance