Add trailing '/' to javadoc links

Work around a bug with Java 8's javadoc tool...

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>
Update json-schema-core dependency

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>
2.0.2

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>