publish empty source and javadocs jars for plugin marker

[gabrielittner]

Closes #116

[codecov]

Codecov Report

Merging #118 into master will decrease coverage by 0.46%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #118      +/-   ##
============================================
- Coverage     34.39%   33.93%   -0.47%     
  Complexity       51       51              
============================================
  Files            21       22       +1     
  Lines           439      445       +6     
  Branches         73       73              
============================================
  Hits            151      151              
- Misses          258      264       +6     
  Partials         30       30              

Impacted Files	Coverage Δ	Complexity Δ
...vanniktech/maven/publish/tasks/EmptyJavadocsJar.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)

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