Increase the linter deadline from 1 min to 5 min. (#220)
Increase the linter deadline from 1 min to 5 min. (#220)

Hopefully will avoid spurious test failures like
https://travis-ci.org/matrix-org/dendrite/builds/272960127
matrix-org/dendrite,jcgruenhage/dendrite,matrix-org/dendrite,matrix-org/dendrite,jcgruenhage/dendrite,gperdomor/dendrite,matrix-org/dendrite,gperdomor/dendrite