Remove the statement that is not always reached.

junaruga · junaruga · commit 913c1665970f · 2018-08-27T15:02:30.000+02:00
diff --git a/lib/coderay/encoders/html/output.rb b/lib/coderay/encoders/html/output.rb
@@ -76,8 +76,6 @@ def wrap! element, *args
             apply_title! title
           end
           self
-        when nil
-          return self
         else
           raise "Unknown value %p for :wrap" % element
         end
