Fix error when skipping actions

Fixes issue #40 that occurred if merged is set to - and a PR is merged, or closed is set to - and a PR is closed without merging.

Add PR number to the backlink

What's Changed

• Add PR number to the backlink in #39

Transition on re/open

With the new opened option it's now possible to enable a transition when a pull request is ready for review (opened, re-opened or marked as ready for review). It's optional and does nothing unless specified.

Handle multiple links in PR body

v1.5.0

Support multiple wrike links in PR body (#34)

Make it possible to disable merged/closed transitions

By setting the merged or closed keys in the configuration to "-" it is now possible to disable those transitions if desired.

Add pull request title to link

Having the pull request title in the backlink makes things clear when multiple PRs might link to one issue

Update to use node16

Github Actions using node12 are deprecated and dumping a mass of warnings on every run.

Update to using node16 and also update dependencies while on it.

Specify desired new status using inputs

Use Action inputs to specify by name what status to move the linked task to when the linked PR is closed (with or without merging).

Support cancelling task

Mark wrike task as Cancelled if the linked PR is closed without merging.

Custom workflow support

Custom workflow support is now live!

On PR merge, the linked wrike task will be marked as Complete (or equivalent) in the (custom) workflow of the task's folder.