Keep up to date

[tcr]

I installed Greenkeeper for Node and a Travis cron job to see if edit-text works on the latest nightly.

• Is there a way to see just the cron jobs that Travis does? The easiest list is https://travis-ci.org/tcr/edit-text/builds, but does not have filtering.
• Right now the nightly cron goes to the "staging" branch, is there a way to just have a branch that is checked nightly instead? Maybe with Github Actions this becomes easier.
• Would be great to also have cargo dependencies updated via greenkeeper or travis + bors.