Error in demultiplex.py with 3' barcode

[CharlotteAnne]

"Handle the case where randomer is already in the header." This did not include if the nucleotide after the rbc is an N, which it often is, meaning that you have ":rbc:" twice in the header.

[codecov-commenter]

Codecov Report

Merging #203 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #203   +/-   ##
=======================================
  Coverage   79.03%   79.03%           
=======================================
  Files          63       63           
  Lines        4532     4532           
=======================================
  Hits         3582     3582           
  Misses        950      950           

Impacted Files	Coverage Δ
iCount/demultiplex.py	95.93% <100.00%> (ø)

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