fix: weird code block corruption (#58)

This issue was produced by the wrong replacement with regex.

Author: jeffreytse

lib/jekyll-spaceship/cores/processor.rb

@@ -193,9 +193,8 @@ def post_exclude(content)
         match = @exclusion_store.pop
         id = @exclusion_store.size
         content = content.sub(
-          "<!JEKYLL@#{object_id}@#{id}>",
-          match.gsub(/(\\\d)/,'\\\\\1')
-        )
+          "<!JEKYLL@#{object_id}@#{id}>"
+        ) { match }
       end
       @exclusion_store = []
       content