Normalize postcode before use

[frenck]

Proposed Changes

Normalizes the postcode before use

Related Issues

home-assistant/core#71339

[codecov-commenter]

Codecov Report

Merging #446 (cc8e2d1) into main (8cf6d56) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #446   +/-   ##
=======================================
  Coverage   91.11%   91.11%           
=======================================
  Files           3        3           
  Lines          90       90           
  Branches       18       18           
=======================================
  Hits           82       82           
  Misses          4        4           
  Partials        4        4           

Impacted Files	Coverage Δ
src/twentemilieu/twentemilieu.py	90.47% <ø> (ø)

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