fix: promisify methods instead of a single function#222

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RafaPegorari wants to merge 1 commit intowebpack-contrib:masterfrom RafaPegorari:master

+31-29

Commits on Feb 8, 2018

fix: webpack-contrib#217 after update to 4.4.0 TypeError: callbacks[i] is not a function
RafaPegorari
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