Update UniVec database. Remove duplicates from oxford_nanopore.fasta

[rhpvorderman]

Checklist

• Pull request details were added to CHANGELOG.rst
• Documentation was updated (if needed)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.61%. Comparing base (b3f1639) to head (28a5f62).
Report is 33 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #192      +/-   ##
===========================================
+ Coverage    95.59%   95.61%   +0.01%     
===========================================
  Files            6        6              
  Lines         1362     1368       +6     
===========================================
+ Hits          1302     1308       +6     
  Misses          60       60              

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