Added lint tests for old depreciated config variables

[ewels]

No description provided.

[codecov-io]

Codecov Report

Merging #149 into dev will increase coverage by 0.05%.
The diff coverage is 91.66%.

@@            Coverage Diff            @@
##              dev    #149      +/-   ##
=========================================
+ Coverage   87.15%   87.2%   +0.05%     
=========================================
  Files           7       7              
  Lines         755     766      +11     
=========================================
+ Hits          658     668      +10     
- Misses         97      98       +1

Impacted Files	Coverage Δ
nf_core/utils.py	100% <100%> (ø)	⬆️
nf_core/bump_version.py	77.61% <100%> (+2.2%)	⬆️
nf_core/lint.py	96.97% <80%> (-0.27%)	⬇️

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[apeltzer]

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