Fix regression vignette

[csoneson]

No description provided.

[codecov]

Codecov Report

Merging #49 (6e84bd2) into master (9bc1696) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   98.79%   98.79%           
=======================================
  Files          13       13           
  Lines        2328     2328           
=======================================
  Hits         2300     2300           
  Misses         28       28           

Impacted Files	Coverage Δ
R/motif_enrichment_kmers.R	96.52% <100.00%> (ø)
R/motif_enrichment_monaLisa.R	100.00% <100.00%> (ø)

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