Update format-code op to call cljfmt with option

[liquidz]

Update format-code op to call cljfmt.core/reformat-string with config option.

• https://github.com/weavejester/cljfmt#configuration

• The commits are consistent with our contribution guidelines
• You've added tests to cover your change(s)
• All tests are passing
• The new code is not generating reflection warnings
• You've updated the README (if adding/changing middleware)

[bbatsov]

Great improvement!

You just need to also update the middleware descriptor (to reflect the extra param) and the changelog and we're good to merge this.

[codecov]

Codecov Report

Merging #556 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #556      +/-   ##
==========================================
+ Coverage   72.84%   72.99%   +0.15%     
==========================================
  Files          36       36              
  Lines        2397     2411      +14     
  Branches      141      141              
==========================================
+ Hits         1746     1760      +14     
  Misses        510      510              
  Partials      141      141

Impacted Files	Coverage Δ
src/cider/nrepl/middleware/format.clj	97.22% <100%> (+1.76%)	⬆️

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[liquidz]

@bbatsov I updated middleware descriptor and changelog.

[bbatsov]

Great work! Thanks a lot! 🙇