Upgrade to AsciidoctorJ 1.5.8.1

Closes gh-621

Author: wilkinsona

build.gradle

@@ -82,7 +82,7 @@ subprojects {
 			dependency 'io.rest-assured:rest-assured:3.0.7'
 			dependency 'org.apache.pdfbox:pdfbox:2.0.7'
 			dependency 'org.assertj:assertj-core:2.9.1'
-			dependency 'org.asciidoctor:asciidoctorj:1.5.6'
+			dependency 'org.asciidoctor:asciidoctorj:1.5.8.1'
 			dependency 'org.asciidoctor:asciidoctorj-pdf:1.5.0-alpha.16'
 			dependency 'org.hamcrest:hamcrest-core:1.3'
 			dependency 'org.hamcrest:hamcrest-library:1.3'

spring-restdocs-asciidoctor/src/test/resources/operations/all-snippets.html

@@ -32,7 +32,7 @@ <h2 id="_http_request">HTTP request</h2>
 <div class="sect1">
 <h2 id="_response_fields">Response fields</h2>
 <div class="sectionbody">
-<table class="tableblock frame-all grid-all spread">
+<table class="tableblock frame-all grid-all stretch">
 <colgroup>
 <col style="width: 33.3333%;">
 <col style="width: 33.3333%;">

spring-restdocs-asciidoctor/src/test/resources/operations/snippet-table.html

@@ -1,7 +1,7 @@
 <div class="sect1">
 <h2 id="_response_fields">Response fields</h2>
 <div class="sectionbody">
-<table class="tableblock frame-all grid-all spread">
+<table class="tableblock frame-all grid-all stretch">
 <colgroup>
 <col style="width: 33.3333%;">
 <col style="width: 33.3333%;">