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docs: update cron docs link

Update the robfig/cron documentation link which currently points to the v3 version and not the v1 version that watchtower uses
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nils måsén 2020-04-01 19:38:35 +02:00 committed by GitHub
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@ -196,7 +196,7 @@ Environment Variable: WATCHTOWER_RUN_ONCE
```
## Scheduling
[Cron expression](https://godoc.org/github.com/robfig/cron#hdr-CRON_Expression_Format) in 6 fields (rather than the traditional 5) which defines when and how often to check for new images. Either `--interval` or the schedule expression
[Cron expression](https://pkg.go.dev/github.com/robfig/cron@v1.2.0?tab=doc#hdr-CRON_Expression_Format) in 6 fields (rather than the traditional 5) which defines when and how often to check for new images. Either `--interval` or the schedule expression
can be defined, but not both. An example: `--schedule "0 0 4 * * *"`
```