#25 Fix Scaladoc for Scala 2.13

[ihostage]

Fixed #25

[codecov-io]

Codecov Report

Merging #26 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #26      +/-   ##
============================================
+ Coverage     78.76%   78.83%   +0.06%     
- Complexity      121      126       +5     
============================================
  Files            14       14              
  Lines           325      326       +1     
  Branches         70       67       -3     
============================================
+ Hits            256      257       +1     
  Misses           20       20              
  Partials         49       49

Impacted Files	Coverage Δ	Complexity Δ
...yr/lagom/scaladsl/openapi/OpenAPIServiceImpl.scala	86.48% <0%> (+0.37%)	18% <0%> (+5%)	⬆️
.../taymyr/lagom/scaladsl/openapi/SpecGenerator.scala	62.5% <0%> (ø)	10% <0%> (+1%)	⬆️

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