#567 Add/change email should be aware of account threshold

src/main/java/fr/xephi/authme/datasource/CacheDataSource.java

@@ -250,9 +250,4 @@ public class CacheDataSource implements DataSource {
     public List<PlayerAuth> getLoggedPlayers() {
         return new ArrayList<>(PlayerCache.getInstance().getCache().values());
     }
-
-    @Override
-    public boolean isEmailStored(String email) {
-        return source.isEmailStored(email);
-    }
 }