Update bytes to version 2.4.0 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

bytes just published its new version 2.4.0, 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 bytes – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 5 commits .

• 2a59844 Release 2.4.0
• 65197f9 Add option "unitSeparator"
• 387bb00 build: cache node_modules on Travis CI
• 9d5aeeb build: Node.js@5.10
• 515e4ee build: Node.js@4.4

See the full diff.

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[codecov-io]

Current coverage is 88.51%

Merging #943 into master will decrease coverage by <.01%

1. File ...ync_module_worker.js (not in diff) was modified. more
   • Misses +1
   • Partials 0
   • Hits -1
2. File services/package.js (not in diff) was modified. more
   • Misses +1
   • Partials 0
   • Hits -1

@@             master       #943   diff @@
==========================================
  Files            85         85          
  Lines          3289       3289          
  Methods         340        340          
  Messages          0          0          
  Branches        612        612          
==========================================
- Hits           2913       2911     -2   
- Misses          376        378     +2   
  Partials          0          0          

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