[MISC] Update Authors in BEP025

[josator2]

Add María de la Iglesia Vayá to authors.

[sappelhoff]

Thanks @josator2 - could you please also add the name to the top of the Google Doc BEP, including an email address? see my comment in the google doc.

Also, our linter (a basic tool to check the markdown syntax) tells us, that there is some formatting error after your changes, you can see them by clicking on the "Travis CI" Details button and then on the page that pops up click on the link integrated in "the build failed".

This will lead you to the error log of the linter: https://travis-ci.com/bids-standard/bids-specification/builds/114921667

Concretely, you have edited a table row and the | (=pipe) characters are now no longer aligned.

This means that you have to realign the table "fences". Let me know if you run into problems with this.