[maven-release-plugin] copy for tag 9.5.0

Allows configuration of status codes that cause Ribbon retries (OpenF…

…eign#492)

[maven-release-plugin] copy for tag 9.4.0

Fixes OpenFeign#462

[maven-release-plugin] copy for tag 9.3.1

Removes use of internal gson class (OpenFeign#452)

Turns out an api was added a very long time ago to do what we do in gson
without use of internal apis.

See OpenFeign#449

[maven-release-plugin] copy for tag 9.3.0

Adds FallbackFactory, allowing access to the cause of a Hystrix fallb…

…ack (OpenFeign#443)

The cause of the fallback is now logged by default to FINE level. You can programmatically inspect
the cause by making your own `FallbackFactory`. In many cases, the cause will be a `FeignException`,
which includes the http status.

Here's an example of using `FallbackFactory`:

```java
// This instance will be invoked if there are errors of any kind.
FallbackFactory<GitHub> fallbackFactory = cause -> (owner, repo) -> {
  if (cause instanceof FeignException && ((FeignException) cause).status() == 403) {
    return Collections.emptyList();
  } else {
    return Arrays.asList("yogi");
  }
};

GitHub github = HystrixFeign.builder()
                            ...
                            .target(GitHub.class, "https://api.github.com", fallbackFactory);
```

[maven-release-plugin] copy for tag 9.2.0

Adds Hystrix SetterFactory to customize group and command keys (OpenF…

…eign#447)

This exposes means to customize group and command keys, for example to
use non-default conventions from configuration or custom annotation
processing.

Ex.
```java
SetterFactory commandKeyIsRequestLine = (target, method) -> {
  String groupKey = target.name();
  String commandKey = method.getAnnotation(RequestLine.class).value();
  return HystrixCommand.Setter
      .withGroupKey(HystrixCommandGroupKey.Factory.asKey(groupKey))
      .andCommandKey(HystrixCommandKey.Factory.asKey(commandKey));
};

api = HystrixFeign.builder()
                  .setterFactory(commandKeyIsRequestLine)
                  ...
```

This also makes the default's more unique to avoid clashing in Hystrix's
cache.