Update meetups/index.md
Update meetups/index.md

Co-Authored-By: Aaron Critchley <fa76f0becc94110b0ee43b13e651420c1a2ebff2@gmail.com>
PyDataLondon/pydatalondon.github.io,PyDataLondon/pydatalondon.github.io,PyDataLondon/pydatalondon.github.io