fix double url encoding

[cathiele]

Possible solution for #5

[codecov]

Codecov Report

Merging #6 (48af5f1) into main (c969c38) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main       #6   +/-   ##
=======================================
  Coverage   98.84%   98.84%           
=======================================
  Files          19       19           
  Lines         606      606           
=======================================
  Hits          599      599           
  Misses          7        7           

Flag	Coverage Δ
unittests	98.84% <100.00%> (ø)

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Impacted Files	Coverage Δ
plantumlcli/models/remote.py	100.00% <100.00%> (ø)

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[HansBug]

I will merge this PR to branch fix/new_version, in PR #7.

The follow-up progress can be traced there.