Paradox 0.6.7

Changes

• Allow matching parenthese pairs to occur inside of directive sou… #386 by @jrudolph
• Javadoc directive: set link style per package #385 by @ennru

Docs

• add "sbt-paradox-diagrams" to extensions #383 by @tg44

Dependencies

• Use sbt 1.3.3, cache coursier and Jabba dirs #388 by @ennru
• Update ST4 to 4.2 #382 by @scala-steward
• Update sbt-paradox to 0.6.6 #379 by @scala-steward
• Update sbt-header to 5.3.0 #384 by @scala-steward
• bump Scala version to 2.12.10 (was 2.12.8) #380 by @SethTisue