Explicitly declare Image to avoid strict-mode error

[woodardj]

No description provided.

[codecov-io]

Codecov Report

Merging #20 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   97.61%   97.64%   +0.02%     
==========================================
  Files           1        1              
  Lines          84       85       +1     
  Branches       22       22              
==========================================
+ Hits           82       83       +1     
  Misses          2        2

Impacted Files	Coverage Δ
index.js	97.64% <100%> (+0.02%)	⬆️

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