Update image-size to version 0.5.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

image-size 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 image-size – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 5 commits .

• 1420c0b improve error description
• bcc1c1f Merge pull request #71 from hupfis/patch-1
• 529d6b5 Improve error description
• e67273e Merge pull request #56 from vinicius0026/master
• c05190f making it clear that async version doesnt work with buffer

See the full diff.

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