chore: release 4.0.1

[wasabeef]

What does this change?

Bug fix

• #134 Support the at symbol (@) in file names.
• #139 Error: Method not found: '$checkedCreate

Development

• Replace to flutter_lints.

[codecov]

Codecov Report

Merging #142 (861cc04) into main (5f5d2db) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #142   +/-   ##
=======================================
  Coverage   98.86%   98.86%           
=======================================
  Files          17       17           
  Lines         529      529           
=======================================
  Hits          523      523           
  Misses          6        6           

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