Add a link to prepaid cellular data plan info for France
Messy merge to replace list element text with links, sorry.

Merge branch 'master' of github.com:la-conf/la-conf.github.io

# By Christopher Dell
# Via Christopher Dell
* 'master' of github.com:la-conf/la-conf.github.io:
  Update params.json
  Replace master branch with page content via GitHub

Conflicts:
	index.html