Ignore 7.4.2 travis failures (re: doctests).
Ignore 7.4.2 travis failures (re: doctests).

Ideally this will be a temporary measure.

rpglover64/lens,cchalmers/lens,Fuuzetsu/lens,Icelandjack/lens,ddssff/lens,Gabriel439/lens,hvr/lens,cdepillabout/lens,danidiaz/lens,omefire/lens,hvr/lens,timjb/lens