Feature/flutter 2.04

[minikin]

• Migrate to NNBD

[codecov]

Codecov Report

Merging #24 (a442eed) into main (665c0e5) will decrease coverage by 0.03%.
The diff coverage is 84.88%.

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   91.78%   91.74%   -0.04%     
==========================================
  Files          11       11              
  Lines         438      436       -2     
==========================================
- Hits          402      400       -2     
  Misses         36       36              

Impacted Files	Coverage Δ
lib/src/popover.dart	83.33% <ø> (-1.29%)	⬇️
lib/src/popover_position_widget.dart	100.00% <ø> (ø)
lib/src/utils/utils.dart	100.00% <ø> (ø)
lib/src/popover_position_render_object.dart	80.00% <77.27%> (ø)
lib/src/popover_render_shifted_box.dart	84.00% <80.00%> (ø)
lib/src/popover_context.dart	100.00% <100.00%> (ø)
lib/src/popover_item.dart	100.00% <100.00%> (ø)
lib/src/popover_path.dart	100.00% <100.00%> (ø)
lib/src/utils/build_context_extension.dart	100.00% <100.00%> (ø)
lib/src/utils/popover_utils.dart	91.66% <100.00%> (+0.75%)	⬆️

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