README: fix mail address in git example command

(From OE-Core rev: ff1c5ee9201cb792bb60f3338a5ee6d2d9f11ef9)

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

README.OE-Core.md

@@ -22,7 +22,7 @@ for full details on how to submit changes.
 As a quick guide, patches should be sent to openembedded-core@lists.openembedded.org
 The git command to do that would be:
 
-     git send-email -M -1 --to openembedded-corel@lists.openembedded.org
+     git send-email -M -1 --to openembedded-core@lists.openembedded.org
 
 Mailing list: