Allow to set preheader

[amureki]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (188a288) 99.72% compared to head (2f71000) 99.72%.

❗ Current head 2f71000 differs from pull request most recent head 639669f. Consider uploading reports for the commit 639669f to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #53   +/-   ##
=======================================
  Coverage   99.72%   99.72%           
=======================================
  Files          10       10           
  Lines         364      367    +3     
=======================================
+ Hits          363      366    +3     
  Misses          1        1           

Files Changed	Coverage Δ
emark/message.py	99.29% <100.00%> (+0.01%)	⬆️

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[codingjoe]

Excellent change