====/hcp/gethandicap====
Retrieve the current handicap for a golfer

parameters:
|auth	|the authorisation code you received from Intogolf BV (mandatory)|
|relnr  |the id of the golfer (mandatory) |

example: https://backend.ikgagolfen.nl/hcp/gethandicap?auth=<your authorisation code>&relnr=12590

result:
<code>{
{
  "gethandicap": [
    {
      "handicap": 22.4
    }
  ]
}</code>

if a wrong authorisation code is provided, the backend will return 401, Unauthorized
if a wrong set of parameters is used, the backend will return 406, Not found