update CLI and SyntaxHighlighter to allow Asciidoctor to load cleanly on Ruby 2.0 - 2.2

2 files changed, 8 insertions, 3 deletions

diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 41c9e76c..0df52279 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -19,6 +19,7 @@ Bug Fixes::
 
   * fix crash when source highlighter is Rouge and source language is not set on block (#3223)
   * make Asciidoctor::SyntaxHighlighter::Config.register_for method public as documented
+  * update CLI and SyntaxHighlighter to allow Asciidoctor to load cleanly on Ruby 2.0 - 2.2
 
 == 2.0.4 (2019-03-31) - @mojavelinux
 
diff --git a/lib/asciidoctor/syntax_highlighter.rb b/lib/asciidoctor/syntax_highlighter.rb
index e9200b84..339862dc 100644
--- a/lib/asciidoctor/syntax_highlighter.rb
+++ b/lib/asciidoctor/syntax_highlighter.rb
@@ -95,7 +95,7 @@ module SyntaxHighlighter
 
   private_class_method def self.included into
     into.extend Config
-  end
+  end || :included
 
   module Config
     # Public: Statically register the current class in the registry for the specified names.
@@ -139,7 +139,9 @@ module SyntaxHighlighter
       end
     end
 
-    private def registry
+    private
+    
+    def registry
       raise ::NotImplementedError, %(#{Factory} subclass #{self.class} must implement the ##{__method__} method)
     end
   end
@@ -151,7 +153,9 @@ module SyntaxHighlighter
       @registry = seed_registry || {}
     end
 
-    private def registry
+    private
+    
+    def registry
       @registry
     end
   end