remove references to document to allow bluefile to be used inside of a webworker

[desean1625]

No description provided.

[codecov-io]

Codecov Report

Merging #23 (1707f06) into master (f86c63e) will decrease coverage by 0.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- Coverage   67.12%   66.82%   -0.31%     
==========================================
  Files           5        5              
  Lines         435      431       -4     
  Branches       73       73              
==========================================
- Hits          292      288       -4     
  Misses        126      126              
  Partials       17       17              

Impacted Files	Coverage Δ
src/util.js	96.47% <100.00%> (-0.16%)	⬇️

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