Update docs for Gradle plugin

[snazy]

Fixes #33

[codecov]

Codecov Report

Merging #34 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #34   +/-   ##
=========================================
  Coverage     92.67%   92.67%           
  Complexity       52       52           
=========================================
  Files             2        2           
  Lines           191      191           
  Branches         34       34           
=========================================
  Hits            177      177           
  Misses            6        6           
  Partials          8        8           

Flag	Coverage Δ	Complexity Δ
#integration	67.01% <ø> (ø)	36.00 <ø> (ø)
#unit	90.05% <ø> (ø)	50.00 <ø> (ø)

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