Implement ISO amendments

[dgg]

Implement amendments:

• 170: Add VED(926)
• 171-173 and 175: deprecate SLL(694) in favor of SLE(925)
• 174: deprecate HRK(191) in favor of EUR(978)

Fixes #70

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.84%. Comparing base (b28bf32) to head (08eed09).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   77.57%   77.84%   +0.27%     
==========================================
  Files          62       62              
  Lines        1128     1124       -4     
  Branches      102      102              
==========================================
  Hits          875      875              
+ Misses        233      229       -4     
  Partials       20       20              

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