anchor.diff:  
   When not specified it reads events starting from `:head` (first domain event
   stored in event store) and without limit.
  -<% end %>
  +<% end%>
   
   ```ruby
   client.read.to_a
  
positive.code: In this case `:begin` means last event of the stream.
  <% else %>
  In this case `:head` means last event of the stream.
  <% end %>
  
  ```ruby
  stream_name = "order_1"
  
negative.code: 
  When not specified it reads events starting from `:head` (last domain event
  stored in event store) and without limit.
  <% end%>
  
  ```ruby
  client.read.backward.to_a
  