Maintenance

[fabianegli]

Inheriting from object is not necessary since Python 3.

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated

[codecov]

Codecov Report

Merging #2032 (17e80aa) into dev (eb19d3f) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #2032      +/-   ##
==========================================
- Coverage   67.41%   67.41%   -0.01%     
==========================================
  Files          42       42              
  Lines        5463     5462       -1     
==========================================
- Hits         3683     3682       -1     
  Misses       1780     1780              

Impacted Files	Coverage Δ
nf_core/download.py	52.72% <100.00%> (ø)
nf_core/launch.py	63.35% <100.00%> (ø)
nf_core/licences.py	22.85% <100.00%> (ø)
nf_core/modules/lint/__init__.py	82.88% <100.00%> (ø)
nf_core/modules/modules_repo.py	84.13% <100.00%> (-0.08%)	⬇️
nf_core/modules/nfcore_module.py	100.00% <100.00%> (ø)
nf_core/schema.py	76.03% <100.00%> (ø)
nf_core/sync.py	75.42% <100.00%> (ø)

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