Update asciidoctor to 1.5.8

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Gemfile

@@ -133,7 +133,7 @@ gem 'rdoc', '~> 6.0'
 gem 'org-ruby', '~> 0.9.12'
 gem 'creole', '~> 0.5.0'
 gem 'wikicloth', '0.8.1'
-gem 'asciidoctor', '~> 1.5.6'
+gem 'asciidoctor', '~> 1.5.8'
 gem 'asciidoctor-plantuml', '0.0.8'
 gem 'rouge', '~> 3.1'
 gem 'truncato', '~> 0.7.9'

Gemfile.lock

@@ -58,7 +58,7 @@ GEM
       faraday_middleware (~> 0.9)
       faraday_middleware-multi_json (~> 0.0)
       oauth2 (~> 1.0)
-    asciidoctor (1.5.6.2)
+    asciidoctor (1.5.8)
     asciidoctor-plantuml (0.0.8)
       asciidoctor (~> 1.5)
     ast (2.4.0)
@@ -942,7 +942,7 @@ DEPENDENCIES
   addressable (~> 2.5.2)
   akismet (~> 2.0)
   asana (~> 0.6.0)
-  asciidoctor (~> 1.5.6)
+  asciidoctor (~> 1.5.8)
   asciidoctor-plantuml (= 0.0.8)
   attr_encrypted (~> 3.1.0)
   awesome_print

Gemfile.rails4.lock

@@ -55,7 +55,7 @@ GEM
       faraday_middleware (~> 0.9)
       faraday_middleware-multi_json (~> 0.0)
       oauth2 (~> 1.0)
-    asciidoctor (1.5.6.2)
+    asciidoctor (1.5.8)
     asciidoctor-plantuml (0.0.8)
       asciidoctor (~> 1.5)
     ast (2.4.0)
@@ -933,7 +933,7 @@ DEPENDENCIES
   addressable (~> 2.5.2)
   akismet (~> 2.0)
   asana (~> 0.6.0)
-  asciidoctor (~> 1.5.6)
+  asciidoctor (~> 1.5.8)
   asciidoctor-plantuml (= 0.0.8)
   attr_encrypted (~> 3.1.0)
   awesome_print

changelogs/unreleased/54010-update-asciidoctor-to-1-5-8.yml

+---
+title: Update asciidoctor to 1.5.8
+merge_request: 23047
+author: Takuya Noguchi
+type: other