adds missing v1.6.0 reference to README (#436)
adds missing v1.6.0 reference to README (#436)


abelsromero/asciidoctor-maven-plugin,asciidoctor/asciidoctor-maven-plugin,asciidoctor/asciidoctor-maven-plugin,abelsromero/asciidoctor-maven-plugin,asciidoctor/asciidoctor-maven-plugin,abelsromero/asciidoctor-maven-plugin