add forecast creation time to update, and to test

[peterdudfield]

Pull Request

Description

Update forecast creation time when updating

Fixes #60

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] Yes

If your changes affect data processing, have you plotted any changes? i.e. have you done a quick sanity check?

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #61 (24531a4) into main (6299156) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   98.51%   98.51%           
=======================================
  Files          17       17           
  Lines         741      743    +2     
=======================================
+ Hits          730      732    +2     
  Misses         11       11           

Impacted Files	Coverage Δ
nowcasting_datamodel/update.py	97.61% <100.00%> (+0.11%)	:arrow_up:

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