Can't run example code in v1.6.0

Hi

This might be a "read the f-ing manual" problem, so apologies in advance. I'm using Julia 1.8.2 and I tried running the below code

```julia
using WebSockets
import JSON

const url = "wss://ws.kraken.com/"

WebSockets.open(url) do ws_client
# msg = "{\"event\":\"subscribe\", \"subscription\":{\"name\":\"trade\"}, \"pair\":[\"XBT/USD\",\"XRP/USD\"]}"

msg = Dict(
"event" => "subscribe",
"subscription" => Dict("name" => "trade"),
"pair" => ["XBT/USDT", "XBT/USD"]
)
msg = JSON.json(msg)

writeguarded(ws_client, msg)

while (true)
data, success = readguarded(ws_client)
if success
println(stderr, ws_client, " received:", String(data))
end

end
end;
```

When I use v1.5.9 it works fine, but with v1.6.0 I get no output.

I also tried this code

```julia
using WebSockets, JSON

uri = "wss://www.bitmex.com/realtime"

payload = Dict(
:op => "subscribe",
:args => "trade:XBT"
)

function open_websocket()
WebSockets.open(uri) do ws
if isopen(ws)
try
write(ws, JSON.json(payload))
catch e
println(e)
end
end

while isopen(ws)
data, success = readguarded(ws)
if success
data = JSON.parse(String(data))
print(data, "\n")
end
end

if !isopen(ws)
@async open_websocket()
end

end
end

open_websocket()
```

Which works in v1.5.9 but in v.1.6.0 I get the following error
```sh
ErrorException("OpenSSL.SSLStream does not support byte I/O")
```

I noticed that when I downgrade down to v1.5.9 HTTP library is also downgraded quite significantly. Here is the log after I run ```add WebSockets@1.5.9```

```sh
(@v1.8) pkg> add WebSockets@1.5.9
Resolving package versions...
Updating `~/.julia/environments/v1.8/Project.toml`
⌅ [cd3eb016] ↓ HTTP v1.9.6 ⇒ v0.9.17
⌃ [104b5d7c] ↓ WebSockets v1.6.0 ⇒ v1.5.9
Updating `~/.julia/environments/v1.8/Manifest.toml`
[d1d4a3ce] - BitFlags v0.1.7
[944b1d66] - CodecZlib v0.7.1
[f0e56b4a] - ConcurrentUtilities v2.2.0
⌅ [cd3eb016] ↓ HTTP v1.9.6 ⇒ v0.9.17
[83e8ac13] + IniFile v0.5.1
[e6f89c97] - LoggingExtras v1.0.0
[4d8831e6] - OpenSSL v1.4.1
[777ac1f9] - SimpleBufferStream v1.1.0
[3bb67fe8] - TranscodingStreams v0.9.13
⌃ [104b5d7c] ↓ WebSockets v1.6.0 ⇒ v1.5.9
```

I'm happy to continue using v1.5.9, but I wonder if anyone else had the same issue. Feel free to ask any clarifying questions :)