Use JDK 11 (LTS) + 13 for AppVeyor builds (#2141)
Use JDK 11 (LTS) + 13 for AppVeyor builds (#2141)

* Use JDK 11 (LTS) + 13 for AppVeyor builds

* Drop JDK 11 on AppVeyor

arturbosch/detekt,arturbosch/detekt,arturbosch/detekt,rock3r/detekt,rock3r/detekt,rock3r/detekt