Update default release description.

Author: kovacsv

appveyor.yml

@@ -66,7 +66,7 @@ for:
       - cd ..
 
 deploy:
-  description: 'Release Description'
+  description: 'News:\n- ...\n\nMigration:\n- ...'
   provider: GitHub
   auth_token:
     secure: oN14X2NG9+1O6cVQ7m2pIUkMxJ4mbZC1oht03WtJPS4E03MfPH8wZYAw9vmkSL9H