Fix inconsistencies in documentation and code

[derekjuber]

Fixes #96

Switched documentation default of defer to false and also changed the code for prepared to reference the first argument as sideEffect, matching the documentation, as opposed to prepare.

Using sideEffect made the code more readable IMO since there's already a prepare source file and different conjugations of the word already used in the same file.

[codecov]

Codecov Report

Merging #116 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #116   +/-   ##
=======================================
  Coverage   78.08%   78.08%           
=======================================
  Files           9        9           
  Lines         146      146           
  Branches       34       34           
=======================================
  Hits          114      114           
  Misses         21       21           
  Partials       11       11

Impacted Files	Coverage Δ
src/prepared.js	83.33% <100%> (ø)	⬆️

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[derekjuber]

!merge