Add Docinfo processor to table of extension types in README
Add Docinfo processor to table of extension types in README

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