add function to update latest, + test

[peterdudfield]

Pull Request

Description

Function to update the latest data table

Fixes #21

How Has This Been Tested?

add a test

• [x] Yes

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

• [ ] Yes

Checklist:

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

[codecov-commenter]

Codecov Report

Merging #24 (663f1ed) into main (e4db78f) will decrease coverage by 0.14%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   97.37%   97.23%   -0.15%     
==========================================
  Files          16       16              
  Lines         534      542       +8     
==========================================
+ Hits          520      527       +7     
- Misses         14       15       +1     

Impacted Files	Coverage Δ
nowcasting_datamodel/read/read.py	97.95% <87.50%> (-0.93%)	:arrow_down:
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)

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