Release v3.1 · savoirfairelinux/opendht

This release focus on improving the Python binding:

python: Added missing permanent boolean argument to DhtRunner.put()
python: Added missing cancelPut method to DhtRunner
python: Added missing configuration fields in DhtRunnerConfig, allowing to use features like the proxy server, peer discovery, and configure specific bound address, allowing to bind to a specific network interface.
python: Added SockAddr.resolve(hostname, service) to allow building SockAddr instances from a string representation of an IP address or hostname, and port or service name:
```
> import opendht as dht
> dht.SockAddr.resolve("bootstrap.jami.net", "4222")
[<SockAddr '198.27.69.48:4222'>]
```

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