AWC SSL (OpenSSL) failure on certificate verification

## Expected Behavior
You connect to an https / wss endpoint with awc to start a websocket connection. When it is connected, you do websocket-y things.

## Current Behavior
The connection panics on verification of certificates

## Possible Solution
N/A

## Steps to Reproduce (for bugs)
1. `git checkout https://github.com/mvniekerk/awc-ws-test`
2. `JWT="" URL="wss://echo.wss-websocket.net" cargo run --bin awc-ws-test`

## Context
I can't connect to my HTTPS/WSS websocket servers

## Your Environment
Ubuntu 20.04
macOS Big Sur

* Rust Version (I.e, output of `rustc -V`): 1.50
* Actix Web Version: 4.0.0-beta.4
* AWC 3.0.0-beta.3