docs(licence): update licence dates

4 jobs for branch/default in 1 minute and 11 seconds (queued for 18 seconds)
Status Job ID Name Coverage
  Test
passed #122060
check-manifest

00:00:24

passed #122061
flake8

00:00:19

passed #122062
py27

00:00:53

passed #122063
py3

00:01:10