fix quote operator and test

[vertical-blank]

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[codecov]

Codecov Report

Merging #47 (8bcdba5) into master (cea92a6) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #47      +/-   ##
============================================
+ Coverage     89.30%   89.32%   +0.01%     
  Complexity      271      271              
============================================
  Files            25       25              
  Lines           898      899       +1     
  Branches         46       46              
============================================
+ Hits            802      803       +1     
  Misses           83       83              
  Partials         13       13              

Impacted Files	Coverage Δ
...al_blank/sqlformatter/languages/StringLiteral.java	96.00% <100.00%> (+0.16%)	⬆️

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