Error: You should not reference the `result` variable inside a void async proc
Let's keep track of libraries being broken by the [corresponding change](https://github.com/status-im/nim-chronos/pull/117).

nim-json-rpc:
```text
/mnt/sda3/storage/CODE/status/nim-beacon-chain-clean/vendor/nim-json-rpc/json_rpc/servers/socketserver.nim(17, 72) template/generic instantiation of `async` from here
/mnt/sda3/storage/CODE/status/nim-beacon-chain-clean/vendor/nim-json-rpc/json_rpc/servers/socketserver.nim(31, 5) template/generic instantiation of `result` from here
/mnt/sda3/storage/CODE/status/nim-beacon-chain-clean/vendor/nim-chronos/chronos/asyncmacro2.nim(209, 18) Error: You should not reference the `result` variable inside a void async proc
```

News:
```text
/mnt/sda3/storage/CODE/status/nim-beacon-chain-clean/vendor/news/src/news.nim(391, 59) template/generic instantiation of `async` from here
/mnt/sda3/storage/CODE/status/nim-beacon-chain-clean/vendor/news/src/news.nim(393, 5) template/generic instantiation of `result` from here
/mnt/sda3/storage/CODE/status/nim-beacon-chain-clean/vendor/nim-chronos/chronos/asyncmacro2.nim(209, 18) Error: You should not reference the `result` variable inside a void async proc
```
