Ignore another plantuml version

[fthomas]

see metabookmarks/sbt-plantuml-plugin#10

[codecov]

Codecov Report

Merging #601 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #601   +/-   ##
=======================================
  Coverage   59.12%   59.12%           
=======================================
  Files          67       67           
  Lines         866      866           
  Branches       23       23           
=======================================
  Hits          512      512           
  Misses        354      354

Impacted Files	Coverage Δ
...scala/org/scalasteward/core/update/FilterAlg.scala	57.89% <ø> (ø)	⬆️

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