fix serialization of init_tan_request for #114

[mwalliczek]

[codecov[bot]]

Codecov Report

Merging #128 (7e38aba) into master (bc1c81e) will increase coverage by 0.18%. The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
+ Coverage   87.48%   87.67%   +0.18%     
==========================================
  Files          23       26       +3     
  Lines        3117     3311     +194     
==========================================
+ Hits         2727     2903     +176     
- Misses        390      408      +18     

Impacted Files	Coverage Δ
fints/client.py	70.95% <62.50%> (-0.23%)	:arrow_down:
fints/message.py	96.96% <0.00%> (ø)
fints/__init__.py	100.00% <0.00%> (ø)
fints/dialog.py	90.96% <0.00%> (ø)

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