message: Document random place method
diff: @@ -509,6 +509,15 @@ block content
  code limit=
  | (not required) Limits number of places matches to return. Defaults to 10. Needs to be less than 100.
  + h3#Random-Place Random Place
  +
  + p Returns a random place and all associated data
  +
  + pre
  + h4
  + .http-method GET
  + | https://api.postcodes.io/random/places
  +
  h2#Install-notes.doc-header Install Notes
  p There may be occasions where you want to host postcodes.io yourself. We've laid out instructions below on how to do this.
  