Set minimum required Java version to Java 8
Set minimum required Java version to Java 8

metafacture/metafacture-core,cboehme/metafacture-core,dswarm/metafacture-core,hbz/metafacture-core,zazi/metafacture-core,cboehme/metafacture-core,metafacture/metafacture-core,hbz/metafacture-core,zazi/metafacture-core,hbz/metafacture-core,culturegraph/metafacture-core,cboehme/metafacture-core,culturegraph/metafacture-core,metafacture/metafacture-core,dswarm/metafacture-core,dswarm/metafacture-core,cboehme/metafacture-core,zazi/metafacture-core,culturegraph/metafacture-core