fix: do not pack rejections from resolve in array

[raphinesse]

Motivation and Context

We use the package resolve to find out if a requested dependency is already installed. That package exports a callback based async API that we promisify using pify. Since the callback of resolve is called with multiple result arguments, we need to use the multiArgs option of pify here. Unfortunately that also wraps the errors of resolve into an array.

Description

This PR unwraps the errors returned by our promisified resolve.

Testing

Manual

[codecov-io]

Codecov Report

Merging #88 into master will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   92.18%   92.30%   +0.12%     
==========================================
  Files           1        1              
  Lines          64       65       +1     
==========================================
+ Hits           59       60       +1     
  Misses          5        5              

Impacted Files	Coverage Δ
index.js	92.30% <100.00%> (+0.12%)	⬆️

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[timbru31]

LGTM