v6

• Update rules to conform with Checkstyle version 8.18
  • Added rules to allow empty lambda expressions and empty types.
  • Changed SuppressionCommentFilter to SuppressWithPlainTextCommentFilter
  • Allowed to extend illegal classes
  • Removed FileContentHolder as it is no longer needed
  • Removed maxLineLength of LeftCurlyCheck as it has been removed
• Fixed company name in POM

v5

Various improvements

• #3 Brackets followed/preceded by empty line
• #5 Space before paranthesis in conditionals

v4

Minor improvements:

• #1 Warn if indentations are not 4 spaces
• #2 Don't allow empty Javadoc on class or interface level

v3

Released to Maven Central.

v2

Initial release.