Update remap-istanbul to version 0.5.0 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

remap-istanbul just published its new version 0.5.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of remap-istanbul – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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[codecov-io]

Current coverage is 100.00%

Merging #5 into master will not affect coverage as of e28581d

@@            master      #5   diff @@
======================================
  Files            1       1       
  Stmts            1       1       
  Branches         0       0       
  Methods          0       0       
======================================
  Hit              1       1       
  Partial          0       0       
  Missed           0       0       

Review entire Coverage Diff as of e28581d

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