Support for go-ipfs v0.5

> This is a notice I'm filling in repo of every HTTP Client I can find.
> **Feel free to close it if this project already works fine with go-ipfs 0.5**

## POST-only HTTP API

go-ipfs 0.5 will block `GET` commands on the API port (https://github.com/ipfs/go-ipfs/pull/7097), requiring every command (RPC) to be sent as HTTP `POST` request.
See API reference docs: https://docs.ipfs.io/reference/api/http/

**This is potentially a breaking change**,
double check if this project uses `POST` for every RPC call.

## Testing

Download links for v0.5-rc* are available at https://github.com/ipfs/go-ipfs/issues/7109

You can also test using an ephemeral Docker container:

```console
$ docker run --rm -it --net=host ipfs/go-ipfs:v0.5.0-rc1
```

Start by locating the Scala client entry points that send IPFS HTTP API commands and compare their request methods with the linked go-ipfs v0.5 API reference. Use the provided Docker command to run go-ipfs v0.5.0-rc1 and verify that every RPC works through POST requests.

Written by the indexing model from the issue text.