In order to discourage folks from connecting securely, we're removing the
convenience method imap::connect_insecure.
Fear not\! For those who manage security in another way (aka a private network
or similar measures), it is still possible to connect without TLS by using the
imap::Client::new() method. See that method for examples of how to do this.
Establishes conditional compilation for all integration with the
native_tls crate in this crate. Since native_tls has been deeply
integrated into this crate for a long time, we want to maintain
backwards compatibility by making this feature part of the default.
For a consumer of this crate to "opt-out", including this in
cargo.toml:
```
[dependencies.imap]
version = 0.16.0 # Replace this with the correct version
default-features = false
```
See the conversation on Github for details on this approach:
https://github.com/jonhoo/rust-imap/issues/123
