Ensuring match.call parameter passing has symbol evaluation

[tynsci]

Fixes #150

[codecov-commenter]

Codecov Report

Merging #236 (17197ae) into master (6e6cb9b) will increase coverage by 0.08%.
The diff coverage is 77.50%.

❗ Current head 17197ae differs from pull request most recent head 2cb99a0. Consider uploading reports for the commit 2cb99a0 to get more accurate results

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
+ Coverage   71.23%   71.32%   +0.08%     
==========================================
  Files          45       45              
  Lines        4009     4017       +8     
==========================================
+ Hits         2856     2865       +9     
+ Misses       1153     1152       -1     

Impacted Files	Coverage Δ
R/pmx-plots-scatter.R	53.84% <53.84%> (ø)
R/pmx-plots-quantile.R	60.00% <60.00%> (-3.64%)	⬇️
R/pmx-all-plots.R	79.03% <92.30%> (+4.52%)	⬆️
R/pmx-plots-density.R	100.00% <100.00%> (ø)
R/pmx-plots-distibution.R	100.00% <100.00%> (ø)
R/pmx-plots-eta-cov.R	100.00% <100.00%> (ø)
R/pmx-plots-individual.R	73.80% <100.00%> (+1.71%)	⬆️
R/pmx-plots-matrix.R	100.00% <100.00%> (ø)
R/pmx-plots-vpc.R	100.00% <100.00%> (ø)
R/pmx-reader.R	43.84% <100.00%> (ø)
... and 2 more

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[mattfidler]

Great!!! LGTM