Map 684 Auxiliary Instruction Note to skos:editorialNote

[nichtich]

MARC field 684 is used for instance in RVK data.

[codecov-io]

Codecov Report

Merging #38 into master will increase coverage by 0.14%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
+ Coverage   78.31%   78.45%   +0.14%     
==========================================
  Files           5        5              
  Lines         701      701              
==========================================
+ Hits          549      550       +1     
+ Misses        152      151       -1

Impacted Files	Coverage Δ
mc2skos/record.py	88.34% <100%> (+0.23%)	:arrow_up:

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[danmichaelo]

Thanks!