Add section for ignored modules in nf-core modules bump-versions

[ErikDanielsson]

Added section for modules ignored with .nf-core.yml to nf-core modules bump-versions. Should close #1234.

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 #1244 (47769f6) into dev (dc10cc4) will decrease coverage by 0.16%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##              dev    #1244      +/-   ##
==========================================
- Coverage   66.46%   66.30%   -0.17%     
==========================================
  Files          50       50              
  Lines        5767     5775       +8     
==========================================
- Hits         3833     3829       -4     
- Misses       1934     1946      +12     

Impacted Files	Coverage Δ
nf_core/modules/bump_versions.py	64.83% <22.22%> (-1.84%)	⬇️
nf_core/modules/create.py	79.27% <0.00%> (-1.04%)	⬇️
nf_core/utils.py	82.75% <0.00%> (-0.75%)	⬇️
nf_core/modules/test_yml_builder.py	48.82% <0.00%> (-0.47%)	⬇️

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