chore: Migrate to async/await

[mindmelting]

BREAKING CHANGE: Support for Node 6 deprecated, now minimum Node 8

[codecov]

Codecov Report

Merging #97 into master will not change coverage.
The diff coverage is 97.53%.

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   96.84%   96.84%           
=======================================
  Files          17       17           
  Lines         222      222           
=======================================
  Hits          215      215           
  Misses          7        7

Impacted Files	Coverage Δ
src/android/generate-manifest-adaptive-icons.js	100% <100%> (ø)	⬆️
src/label/label-image.js	100% <100%> (ø)	⬆️
src/resize/resize-image.js	100% <100%> (ø)	⬆️
src/init/init.js	100% <100%> (ø)	⬆️
src/android/generate-manifest-icons.js	100% <100%> (ø)	⬆️
src/android/find-android-manifests.js	100% <100%> (ø)	⬆️
src/generate.js	100% <100%> (ø)	⬆️
src/ios/generate-iconset-icons.js	100% <100%> (ø)	⬆️
src/ios/find-iconset-folders.js	100% <100%> (ø)	⬆️
src/imagemagick/get-image-width.js	75% <71.42%> (ø)	⬆️

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[codecov]

Codecov Report

Merging #97 into master will increase coverage by 2.22%.
The diff coverage is 98.37%.

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
+ Coverage   96.84%   99.07%   +2.22%     
==========================================
  Files          17       16       -1     
  Lines         222      216       -6     
==========================================
- Hits          215      214       -1     
+ Misses          7        2       -5

Impacted Files	Coverage Δ
src/android/generate-manifest-adaptive-icons.js	100% <100%> (ø)	⬆️
src/label/label-image.js	100% <100%> (ø)	⬆️
src/resize/resize-image.js	100% <100%> (ø)	⬆️
src/utils/file-exists.js	100% <100%> (+14.28%)	⬆️
src/init/init.js	100% <100%> (ø)	⬆️
src/android/find-android-manifests.js	100% <100%> (ø)	⬆️
src/ios/generate-iconset-icons.js	100% <100%> (ø)	⬆️
src/android/generate-manifest-icons.js	100% <100%> (ø)	⬆️
src/generate.js	100% <100%> (ø)	⬆️
src/utils/delete-if-exists.js	100% <100%> (+14.28%)	⬆️
... and 3 more

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[mindmelting]

@dwmkerr Could you take a first review at this? The node10 test failed as one of them went over 10 seconds strangely - if you kick it off again it should work

[dwmkerr]

Ace! I've left a few comments, some about your changes, some about potential improvements. If you agree with the potential improvements (which go beyond the scope of these changes) then comment and I'll raise separate tickets.

[mindmelting]

@dwmkerr Take another peek - removed the operations code smell, and added node eslint plugin - other refactoring opportunities should probably take place outside of this PR

[dwmkerr]

@mindmelting looking great. Can you squash and re-push? That way you will appear as the author in the commit history. If I squash, it'll create a single commit with me as the author and I'd like to keep you in the history, so that I can auto-generate 'contributor' files in the future. TY for the comments too @tobiasbueschel. The failing test seems intermittent, it might just need a longer timeout for the one which works on adaptive icons...

[mindmelting]

@dwmkerr This should be squashed correctly now

[dwmkerr]

Released as 0.12.0. Even though this a breaking change, I'm not bumping to 1.0.0 yet, I'll stay on a 0.X line as I still expect API changes in the near term. Once things are really settled I'll cut a genuine v1 release.

Thanks for the help @mindmelting - this will make future changes much easier