refactor(cron): make delimiter runes constant variables

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.67%. Comparing base (60094f6) to head (f2bb4d9).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #123 +/- ## ======================================= Coverage 94.67% 94.67% ======================================= Files 19 19 Lines 958 958 ======================================= Hits 907 907 Misses 32 32 Partials 19 19 ```

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