Version 0.6.11

Just after 0.6.10 was out another nasty bug has been discovered, preventing from proper usage of URLs with an unescaped double-hash (##), which may come when a matrix.to URL is generated for a bridged IRC channel (and it even got a very nice number #512). Aside from this fix, quotest will not return with success code 0 any more if it failed to even start testing for some reason (#496).