Fixed all the bug for the latest version of Flutter

[StroeAndreX]

Fixed Bugs & Updated all packages to the latest version :)

[codecov-commenter]

Codecov Report

Merging #49 (08b607a) into master (fcc2389) will decrease coverage by 3.59%.
The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
- Coverage   77.09%   73.49%   -3.60%     
==========================================
  Files         136      136              
  Lines        6504     6513       +9     
==========================================
- Hits         5014     4787     -227     
- Misses       1490     1726     +236     

Impacted Files	Coverage Δ
lib/src/widgets/selection/overlay_manager.dart	75.47% <0.00%> (-7.55%)	⬇️
lib/src/widgets/selectable.dart	77.96% <16.66%> (-1.57%)	⬇️
lib/src/widgets/selection/overlay.dart	77.67% <100.00%> (-11.61%)	⬇️
lib/src/render/layout/layout_builder_baseline.dart	51.61% <0.00%> (-35.49%)	⬇️
lib/src/render/layout/line_editable.dart	27.47% <0.00%> (-33.34%)	⬇️
lib/src/render/layout/custom_layout.dart	50.00% <0.00%> (-26.86%)	⬇️
lib/src/widgets/selection/handle_overlay.dart	73.56% <0.00%> (-22.99%)	⬇️
lib/src/render/layout/reset_dimension.dart	47.82% <0.00%> (-20.29%)	⬇️
lib/src/render/layout/min_dimension.dart	48.21% <0.00%> (-14.29%)	⬇️
lib/src/render/layout/vlist.dart	47.52% <0.00%> (-13.87%)	⬇️
... and 16 more

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