Fix HTTPS connections (#64)

Issue: CLI cannot connect with HTTPS to an RPC

```
thread 'main' panicked at cli/src/main.rs:74:44:
connects: tonic::transport::Error(Transport, ConnectError(HttpsUriWithoutTlsSupport(())))
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

Author: esemeniuc