Fix non-strings in sendpoi

[rikroe]

Proposed change

Fixes parsing of POI with numeric postcodes.

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to this library)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:

Checklist

• The code change is tested and works locally.
• Tests have been added to verify that the new code works.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9d3bd67) 100.00% compared to head (3a52e1e) 100.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #590   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files           17        17           
  Lines         1412      1412           
=========================================
  Hits          1412      1412           

Flag	Coverage Δ
3.10	100.00% <100.00%> (ø)
3.11	100.00% <100.00%> (ø)
3.12	100.00% <100.00%> (ø)
3.8	100.00% <100.00%> (ø)
3.9	100.00% <100.00%> (ø)

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