Bump JRuby to 9.4 (#173)

* Bump JRuby to 9.4

* Upgrade neo4j-extensions

Author: ggrossetie

build.gradle

@@ -24,7 +24,7 @@ repositories {
 }
 
 dependencies {
-    asciidoctorGems 'rubygems:neo4j-asciidoctor-extensions:0.1.0'
+    asciidoctorGems 'rubygems:neo4j-asciidoctor-extensions:1.0.2'
 }
 
 zendesk {
@@ -35,7 +35,9 @@ zendesk {
 def stage = project.findProperty('stage')
 
 asciidoctorj {
+    jrubyVersion = '9.4.0.0' 
     version = '2.5.7'
+    //pdfVersion = '2.3.4'
     requires "${rootProject.projectDir}/resources/extensions.rb"
     attributes 'allow-uri-read': '',
             'assets-cdn': 'https://s3.amazonaws.com/dev.assets.neo4j.com/kb-content',