401 Unauthorized and INVALID_SIGNATURE on Linux

[dematron]

Hello.
While using your project I find a very strange behavior of this part of code in client.go
preSignatura := []string{strconv.Itoa(int(nonce)), req.URL.String(), method, payloadHash}
If I run my project on macOS - everything is normal, but when I try to run the same code on Linux (f.e. Raspbian on RPi4), I've got 401 Unauthorized and INVALID_SIGNATURE in debug.
Response is like this
[381487000 https://api.bittrex.com/v3/balances GET hashed_part_here]
Very strange timestamp.
I found that if I refactor your code like this
preSignatura := []string{fmt.Sprintf("%d", nonce), req.URL.String(), method, payloadHash}
everything work perfect and response is correct.
May be you know why it's working so strange?

[PierreRAFFA]

It looks like the issue is still there for linux

[toorop]

Can someone make a PR ? Thx.