add --ignore option

[KevinMenden]

Add the --ignore, -i option to nf-core modules bump-versions to allow ignoring certain modules when bumping software versions.

It's not a blacklist, but it also serves to fix #1142

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 #1150 (9622112) into dev (5e9e33c) will increase coverage by 0.04%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##              dev    #1150      +/-   ##
==========================================
+ Coverage   69.22%   69.27%   +0.04%     
==========================================
  Files          50       50              
  Lines        5232     5247      +15     
==========================================
+ Hits         3622     3635      +13     
- Misses       1610     1612       +2     

Impacted Files	Coverage Δ
nf_core/__main__.py	57.02% <66.66%> (+0.11%)	⬆️
nf_core/modules/bump_versions.py	80.00% <86.66%> (+0.48%)	⬆️

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[ErikDanielsson]

LGTM!

[KevinMenden]

Closing in favour of #1164