README.md: Remove meta-oe dependency

There is no direct dependency on meta-oe but only through the exiting
meta-python dependency. There is no need to advertise dependencies of
dependencies. This is also in line with layer.conf.

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

README.md

@@ -19,10 +19,6 @@ The meta-python-extra layer depends on:
   * layers: meta
   * branch: dunfell
   * revision: HEAD
-* URI: git://git.openembedded.org/meta-openembedded
-  * layers: meta-oe
-  * branch: dunfell
-  * revision: HEAD
 * URI: git://git.openembedded.org/meta-openembedded
   * layers: meta-python
   * branch: dunfell