change how closeAndReleaseRepository is created to avoid ClassCastException

[gabrielittner]

I'm not sure why the crash was happening, but this avoids it by avoiding the cast entirely. The task is now also created lazily. I've tested it locally on Kotlinpoet with an includeBuild.

Closes #156

[codecov]

Codecov Report

Merging #157 into master will decrease coverage by 1.65%.
The diff coverage is 21.42%.

@@             Coverage Diff              @@
##             master     #157      +/-   ##
============================================
- Coverage     45.35%   43.69%   -1.66%     
+ Complexity       52       50       -2     
============================================
  Files            20       20              
  Lines           366      373       +7     
  Branches         58       58              
============================================
- Hits            166      163       -3     
- Misses          174      184      +10     
  Partials         26       26              

Impacted Files	Coverage Δ	Complexity Δ
.../com/vanniktech/maven/publish/ProjectExtensions.kt	18.18% <0.00%> (-10.39%)	0.00 <0.00> (ø)
...nniktech/maven/publish/tasks/AndroidJavadocsJar.kt	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../com/vanniktech/maven/publish/tasks/JavadocsJar.kt	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../vanniktech/maven/publish/nexus/NexusConfigurer.kt	55.55% <42.85%> (-44.45%)	1.00 <0.00> (ø)
...ven/publish/nexus/CloseAndReleaseRepositoryTask.kt	0.00% <0.00%> (-15.39%)	0.00% <0.00%> (-2.00%)

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