ExternalResource (spotify-web-api-java 1.3.2 API)

java.lang.Object
- org.junit.rules.ExternalResource

```
public class ExternalResource
extends Object
```
Fake ExternalResource class from junit4 to get rid of the direct junit4 dependency of MockWebServer.
This class can be removed if MockWebServer has removed its dependency to junit4. Also see the two issues:
- https://github.com/square/okhttp/issues/4667
- https://github.com/square/okhttp/issues/2635

- Constructor Summary
  
  Constructors
  Constructor Description
  
  ExternalResource()
- Method Summary
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ExternalResource
```
public ExternalResource()
```