Setting lastmod modifies creation

[yajo]

See:

Peek.10-04-2021.15-32.mp4

It should have modified the modified field only.

[c-antin]

additionally it changes the date format

[estruyf]

This seems to be related to the js-yaml dependency which transforms it to UTC. Did a change internally to store the date as a string. This will make YAML not parse it.

This will not automatically work for you. The best is to wrap the dates with single quotes: '

[estruyf]

Fix will be released with v1.17.1