Checkstyle 8.20

[romani...@gmail.com]

Checkstyle 8.20 - https://checkstyle.org/releasenotes.html#Release_8.20

New:

  New MissingJavadocCheck(s)

Bug fixes:

  IllegalType: illegal types in overridden methods should not be reported

  EmptyLineSeparator check does not validate newlines before comments

  Exception in JavadocMethod to get access to class in jdk9

  RightCurly false-positives for multi-block continuation

  TranslationCheck reports duplicate lines in xml report

  AnnotationUseStyle: false positive on annotation with default nested annotation inside

  RightCurly with option alone false negative for class, method and constructor

Notes:

   Align XDocs and Javadocs for coding package

  set up JDK12 buid

  minor: GeneratedJava14LexerTest depends on encoding, not on OS, so fix the assumption to represent this

  MultipleVariableDeclarations missing from sun style

  doc: expand documentation for scope property type

  pitest: increase mutation coverage for api profile to 100%

  Remove usage of antlr specific methods from our checks

  idea: fix ThisEscapedInConstructor idea violation for AbstractClassCouplingCheck.FileContext class

  Test inputs should be completely standalone.

  Fix pitest coverage for RightCurly