Ignore updates where currentVersion and newerVersion are identical

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #559 into master will increase coverage by 0.2%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #559     +/-   ##
=========================================
+ Coverage   56.91%   57.12%   +0.2%     
=========================================
  Files          65       65             
  Lines         831      835      +4     
  Branches       38       39      +1     
=========================================
+ Hits          473      477      +4     
  Misses        358      358

Impacted Files	Coverage Δ
.../main/scala/org/scalasteward/core/sbt/parser.scala	100% <100%> (ø)	⬆️

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