lint pyproject.toml file exists and content

[mirpedrol]

nf-core lint will WARN if file pyproject.toml doesn't exist.
The file must contain the same lines as the template, and more lines can be added.

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #1795 (d5cbde0) into dev (f330044) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1795   +/-   ##
=======================================
  Coverage   69.23%   69.23%           
=======================================
  Files          59       59           
  Lines        7148     7148           
=======================================
  Hits         4949     4949           
  Misses       2199     2199           

Impacted Files	Coverage Δ
nf_core/lint/files_exist.py	78.00% <ø> (ø)
nf_core/lint/files_unchanged.py	72.61% <ø> (ø)

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[ewels]

LGTM 👍🏻