Unify setup, improve a few things and bump versions.

[vanniktech]

No description provided.

[codecov]

Codecov Report

Merging #59 into master will increase coverage by 62.79%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master      #59       +/-   ##
=============================================
+ Coverage     22.09%   84.88%   +62.79%     
- Complexity        8       20       +12     
=============================================
  Files             2        2               
  Lines            86       86               
  Branches          9        9               
=============================================
+ Hits             19       73       +54     
+ Misses           63        7       -56     
- Partials          4        6        +2

Impacted Files	Coverage Δ	Complexity Δ
.../javadoc/extensions/AndroidJavadocExtension.groovy	60% <0%> (+60%)	0% <0%> (ø)	⬇️
...y/com/vanniktech/android/javadoc/Generation.groovy	86.41% <0%> (+62.96%)	20% <0%> (+12%)	⬆️

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