Update bleach from 3.1.4 to 3.1.5 (#1447)
Update bleach from 3.1.4 to 3.1.5 (#1447)

Co-authored-by: Fábio Rosado <504d498c4e6912c88badf931727242f17b94f32f@gmail.com>
FabioRosado/opsdroid,opsdroid/opsdroid,jacobtomlinson/opsdroid