Appease Rubocop

Author: DirtyF

lib/jekyll-gist/gist_tag.rb

@@ -26,17 +26,18 @@ def render(context)
           script_tag = gist_script_tag(gist_id, filename)
           "#{noscript_tag}#{script_tag}"
         else
-          raise ArgumentError, <<-EOS
-  Syntax error in tag 'gist' while parsing the following markup:
+          raise ArgumentError, <<~ERROR
+          Syntax error in tag 'gist' while parsing the following markup:
 
-    #{@markup}
+          #{@markup}
 
-  Valid syntax:
-    {% gist user/1234567 %}
-    {% gist user/1234567 foo.js %}
-    {% gist 28949e1d5ee2273f9fd3 %}
-    {% gist 28949e1d5ee2273f9fd3 best.md %}
-          EOS
+          Valid syntax:
+            {% gist user/1234567 %}
+            {% gist user/1234567 foo.js %}
+            {% gist 28949e1d5ee2273f9fd3 %}
+            {% gist 28949e1d5ee2273f9fd3 best.md %}
+
+          ERROR
         end
       end