message: Update about page for os open names
diff: @@ -155,11 +155,11 @@ block content
  tr
  td Release Date
  td May 2017
  - td January 2017
  + td April 2017
  tr
  td Data Points
  td 1,754,882
  - td 42,007
  + td 42,006
  p Beyond the dates listed above, please be aware that the real world dataset may change. Existing postcodes and places may be amended or discontinued. This information will not be captured until the next available update.
  