Prepare package for further development

[kamilzyla]

Changes

1. Add development version .9000 in DESCRIPTION.
2. Update NEWS.md

[jakubnowicki]

LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cb5d24f) 17.73% compared to head (e409c65) 17.73%.

❗ Current head e409c65 differs from pull request most recent head 8ac9e7d. Consider uploading reports for the commit 8ac9e7d to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #551   +/-   ##
=======================================
  Coverage   17.73%   17.73%           
=======================================
  Files           9        9           
  Lines         406      406           
=======================================
  Hits           72       72           
  Misses        334      334           

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