Use custom exception type for unsupported format

Julien LepillerSat Oct 13 10:44:58+0200 2018

2594d5e

offlate/doc
namelast commitdate
conf.pyInitial commitMon Apr 02 21:51:58+0200 2018
index.rstInitial commitMon Apr 02 21:51:58+0200 2018