workaround bug in Eclipse Gradle plugin
workaround bug in Eclipse Gradle plugin

- define source & target compatibility in build.gradle

ysb33r/asciidoctorj,solent/asciidoctorj,asciidoctor/asciidoctorj,ancho/asciidoctorj,danielgrycman/asciidoctorj,ysb33r/asciidoctorj,lefou/asciidoctorj,solent/asciidoctorj,robertpanzer/asciidoctorj,robertpanzer/asciidoctorj,asciidoctor/asciidoctorj,ysb33r/asciidoctorj,lefou/asciidoctorj,ysb33r/asciidoctorj,abelsromero/asciidoctorj,abelsromero/asciidoctorj,ancho/asciidoctorj,asciidoctor/asciidoctorj,robertpanzer/asciidoctorj,danielgrycman/asciidoctorj,lefou/asciidoctorj,lefou/asciidoctorj,abelsromero/asciidoctorj,solent/asciidoctorj,solent/asciidoctorj,danielgrycman/asciidoctorj,ancho/asciidoctorj,danielgrycman/asciidoctorj