Fix missing files to the test

[tsutsu3]

The following missing files were added to test:

• utils.py
• fixtures/links.txt
• fixtures/no_links.txt
• __init__.py

I ran tests and success.

wget https://test-files.pythonhosted.org/packages/be/ba/02c101e77a324fb292120c90084fb4dc712c063f5244f9f6a48447490fb9/linkify-it-py-2.0.1.dev6.tar.gz
tar xzfv linkify-it-py-2.0.1.dev6.tar.gz
cd linkify-it-py-2.0.1.dev6
pip install tox
tox

[codecov-commenter]

Codecov Report

Merging #44 (ea84f57) into main (ff8a338) will not change coverage.
The diff coverage is n/a.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   97.74%   97.74%           
=======================================
  Files           4        4           
  Lines         311      311           
  Branches       53       53           
=======================================
  Hits          304      304           
  Misses          4        4           
  Partials        3        3           

Flag	Coverage Δ
pytests	97.74% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more