Collect enums in variableDefinitions

[brandon-leapyear]

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Fixes #58

[brandon-leapyear]

Forgot to commit this in #56

[codecov]

Codecov Report

Merging #59 (6164459) into master (d2d3bed) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   91.81%   91.89%   +0.08%     
==========================================
  Files          29       29              
  Lines         464      481      +17     
  Branches       58       62       +4     
==========================================
+ Hits          426      442      +16     
- Misses         38       39       +1     

Impacted Files	Coverage Δ
graphql-codegen-haskell/src/parse/operation.ts	100.00% <100.00%> (ø)
...ql-codegen-haskell/src/parse/variableDefinition.ts	100.00% <100.00%> (ø)
example/src/Example/GraphQL/Scalars/Date.hs	45.45% <0.00%> (-9.10%)	⬇️

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