style: yaml => yml

[edmundmiller]

It's the only yaml file in a sea of yml

[grst]

Team yml 🎉

But seriously, does it have any side-effects?

[ewels]

MultiQC shouldn't care, it loads both. It may affect template sync stuff maybe? But yeah it's probably fine.

[maxulysse]

@emiller88 If you fix the tests as well, would be perfect

[codecov]

Codecov Report

Merging #1471 (136c34b) into dev (3abb7ef) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##              dev    #1471   +/-   ##
=======================================
  Coverage   64.87%   64.87%           
=======================================
  Files          52       52           
  Lines        6055     6055           
=======================================
  Hits         3928     3928           
  Misses       2127     2127           

Impacted Files	Coverage Δ
nf_core/lint/files_exist.py	81.81% <ø> (ø)
nf_core/lint/multiqc_config.py	80.43% <50.00%> (ø)

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[edmundmiller]

@maxulysse Done!