scalafix integration

[fthomas]

Towards #149. There is not much here yet, but I think it makes sense to open this PR anyway as place for further discussion.

/cc @amarrella @Daenyth

[codecov]

Codecov Report

Merging #153 into master will increase coverage by 1.48%.
The diff coverage is 80.48%.

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
+ Coverage   58.04%   59.53%   +1.48%     
==========================================
  Files          65       67       +2     
  Lines         820      865      +45     
  Branches       39       37       -2     
==========================================
+ Hits          476      515      +39     
- Misses        344      350       +6

Impacted Files	Coverage Δ
...la/org/scalasteward/core/application/Context.scala	0% <ø> (ø)	⬆️
...main/scala/org/scalasteward/core/sbt/command.scala	100% <100%> (ø)	⬆️
...main/scala/org/scalasteward/core/util/string.scala	81.48% <100%> (+0.71%)	⬆️
...main/scala/org/scalasteward/core/sbt/package.scala	60% <100%> (+4.44%)	⬆️
.../main/scala/org/scalasteward/core/sbt/SbtAlg.scala	48.78% <20%> (-4%)	⬇️
...ain/scala/org/scalasteward/core/edit/EditAlg.scala	91.66% <75%> (-8.34%)	⬇️
...in/scala/org/scalasteward/core/model/Version.scala	87.5% <87.5%> (ø)
...scala/org/scalasteward/core/scalafix/package.scala	90% <90%> (ø)
... and 1 more

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[Daenyth]

As good as place as any to start

[fthomas]

scala-steward just created its first PR using a scalafix migration!
✨ fthomas/scala-pet-store#13 ✨

Unfortunately the scalafix changes are not nicely formatted so we probably need to run scalafmt before creating the PR.

[fthomas]

The latest PR created with the changes on this branch is https://github.com/fthomas/scalafix-test/pull/5/files