Allow multiple files

[crazy-max]

Fixes #136

[codecov]

Codecov Report

Merging #140 (b5962c2) into master (925acc7) will decrease coverage by 4.27%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
- Coverage   97.50%   93.22%   -4.28%     
==========================================
  Files           2        3       +1     
  Lines          40       59      +19     
  Branches        8       10       +2     
==========================================
+ Hits           39       55      +16     
- Misses          1        3       +2     
- Partials        0        1       +1     

Impacted Files	Coverage Δ
src/context.ts	82.35% <82.35%> (ø)
src/installer.ts	97.29% <100.00%> (+0.15%)	⬆️

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