Issue/update last data

[peterdudfield]

Pull Request

Description

add in last data updated

Fixes #20

How Has This Been Tested?

normal tests

• [ ] 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 #21 (d5cfb4e) into main (9219f51) will increase coverage by 0.17%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   93.93%   94.11%   +0.17%     
==========================================
  Files           4        4              
  Lines         165      170       +5     
==========================================
+ Hits          155      160       +5     
  Misses         10       10              

Impacted Files	Coverage Δ
pvconsumer/app.py	90.69% <100.00%> (+0.57%)	:arrow_up:
pvconsumer/pv_systems.py	97.36% <100.00%> (ø)

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