hasKey fix

[ghost]

fix for #112. Hopefully it's helpful.

[codecov-io]

Current coverage is 100.00%

Merging #113 into master will not affect coverage as of adcb82c

@@            master    #113   diff @@
======================================
  Files            1       1       
  Stmts            6       6       
  Branches         0       0       
  Methods          0       0       
======================================
  Hit              6       6       
  Partial          0       0       
  Missed           0       0       

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[acdlite]

Thanks! There's a babel-relay-plugin error that's causing the tests to fail, but I trust that this works.