Allow specifying conda package version in nf-core modules create

[ErikDanielsson]

Added new --conda-package-version flag for specifying version of conda package in nf-core modules create. #1238

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 #1242 (658dce5) into dev (389729c) will increase coverage by 1.12%.
The diff coverage is 66.66%.

❗ Current head 658dce5 differs from pull request most recent head 75ecac0. Consider uploading reports for the commit 75ecac0 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1242      +/-   ##
==========================================
+ Coverage   66.72%   67.84%   +1.12%     
==========================================
  Files          50       50              
  Lines        5692     5564     -128     
==========================================
- Hits         3798     3775      -23     
+ Misses       1894     1789     -105     

Impacted Files	Coverage Δ
nf_core/__main__.py	55.60% <66.66%> (+2.88%)	⬆️
nf_core/modules/create.py	78.68% <66.66%> (-1.85%)	⬇️
nf_core/modules/modules_repo.py	64.55% <0.00%> (-11.00%)	⬇️
nf_core/lint/readme.py	68.96% <0.00%> (-10.35%)	⬇️
nf_core/modules/test_yml_builder.py	45.98% <0.00%> (-3.31%)	⬇️
nf_core/modules/modules_command.py	55.61% <0.00%> (-1.68%)	⬇️
nf_core/modules/update.py	7.50% <0.00%> (-0.80%)	⬇️
nf_core/lint/files_unchanged.py	75.34% <0.00%> (-0.66%)	⬇️
nf_core/modules/remove.py	79.59% <0.00%> (-0.41%)	⬇️
... and 21 more

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