Some African capitals to Metro extracts

Hi Mike,

I'm not sure I still understand/remember how to do this.
I made additions to the cities.txt, which seem to result into https://github.com/jaakkoh/Extractotron/blob/master/cities.txt . .. Now, it seems that this gets suggested into the main list only if I do this Sending of a pull request? .. Or, at least it seems to me that nothing happened after I just finished the edits (as you've seem to just added some contribution and not included these).

Sorry for the stupid Q but I can't remember for the life of me how I did it the last (=first) time.

Thanks!