Link to Swagger API is broken

[MALPI]

The link mentioned in the README.md which should referr to the swagger API is broken and leads to a png.

http://online.swagger.io/validator?url=https://raw.githubusercontent.com/zalando/nakadi/nakadi-jvm/api/nakadi-event-bus-api.yaml

[LappleApple]

+1, same for me

[dehora]

I had a look. The readme markdown looks correct, but it seems the swagger.io validator returns a request with no content type

bdehora$ curl -v https://online.swagger.io/validator/\?url\=https://raw.githubusercontent.com/zalando/nakadi/nakadi-jvm/api/nakadi-event-bus-api.yaml
*   Trying 23.22.16.221...
* Connected to online.swagger.io (23.22.16.221) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
* Server certificate: *.swagger.io
* Server certificate: DigiCert SHA2 Secure Server CA
* Server certificate: DigiCert Global Root CA
> GET /validator/?url=https://raw.githubusercontent.com/zalando/nakadi/nakadi-jvm/api/nakadi-event-bus-api.yaml HTTP/1.1
> Host: online.swagger.io
> User-Agent: curl/7.43.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Date: Tue, 31 May 2016 17:46:11 GMT
< Access-Control-Allow-Origin: *
< Access-Control-Allow-Methods: GET, POST, DELETE, PUT
< Access-Control-Allow-Headers: Content-Type
< Cache-Control: no-cache
< Connection: close
< Server: Jetty(9.2.9.v20150224)

I'm fairly sure this is screwing up github's image proxy. The answer here might be to remove the badge.