message: docs(SPD): Document data types and endpoint
diff: </tr>
  </tbody>
  </table>
  + <h4>Scottish Postcode Data (Scottish Postcode Directory)</h4>
  + <p>Data returned by the <code>/scotland/*</code> APIs</p>
  + <table class="table table-hover">
  + <thead>
  + <tr>
  + <th>Field</th>
  + <th>Description</th>
  + </tr>
  + </thead>
  + <tbody>
  + <tr id="postcode">
  + <td>postcode <br/> <code>string</code></td>
  + <td><strong>Postcode. </strong> Royal Mail postcode.</td>
  + </tr>
  + <tr id="scottish_parliamentary_constituency">
  + <td>scottish_parliamentary_constituency <br/> <code>string</code></td>
  + <td><strong>Scottish Parliamentary Constituency </strong>2014 Scottish Parliamentary Constituency.</td>
  + </tr>
  + <tr id="codes-spd">
  + <td>codes <br/> <code>Object</code></td>
  + <td><strong>Returns an ID or Code associated with the postcode.</strong> Typically, these are a 9 character code known as an ONS Code or GSS Code.</td>
  + </tr>
  + <tr id="code-scottish_parliamentary_constituency">
  + <td>codes.scottish_parliamentary_constituency <br/> <code>string</code></td>
  + <td><strong>Scottish Parliamentary Constituency GSS Code. </strong> A code that identifies a 2014 Scottish Parliamentary Constituency.</td>
  + </tr>
  + </tbody>
  + </table>
  <h4>Terminated Postcode Data (Ordnance Survey Postcode Directory Dataset)</h4>
  - <p>Data returned by the <code>/terminated_postcodes</code> API</p>
  + <p>Data returned by the <code>/terminated_postcodes/*</code> APIs</p>
  <table class="table table-hover">
  <thead>
  <tr>
  <p><code>radius=</code> (not required) Limits number of postcodes matches to return. Defaults to 5,000m. Needs to be less than 25,000m.</p>
  <h4>Additional Response Attributes</h4>
  <p><code>distance</code> Distance in metres from specified postode</p>
  + <h3 id="scottish-postcode">Scottish Postcode Lookup</h3>
  + <p>Lookup a Scottish postcode. Returns SPD data associated with postcode. At the moment this is just Scottish Parliamentary Constituency. Returns 404 if postcode does not exist in SPD or is not valid.</p><pre><h4><div class="http-method">GET</div>https://api.postcodes.io/scotland/postcodes/:postcode</h4></pre>
  + <h3
  <h3 id="Terminated">Terminated Postcode Lookup</h3>
  <p>Lookup a terminated postcode. Returns the postcode, year and month of termination. Returns 404 if postcode does not exist in our database of terminated postcodes or not valid.</p><pre><h4><div class="http-method">GET</div>https://api.postcodes.io/terminated_postcodes/:postcode</h4></pre>
  <h3
  