Enquiry for importing LetsEncrypt certificate

Hello,

We are using your lib with version 2.0.0

Currently we are using the following approach to setup ssl:

```
BdkCertificateConfig certificateConfig = new BdkCertificateConfig(); // then setup the certificate path
BdkBotConfig botConfig = new BdkBotConfig();
botConfig.setCertificate(certificateConfig);
```

Recently we found that the pod was migrated to has new certificates issued from Let's Encrypt, not from DigiCert, and we cannot connect anymore after importing new cert (javx.net.ssl.SSLHandshakeException: Remove host closed connection during handshake)

And from this page, we found that looks like we need to import a root cert and intermediate cert in order to auth.

https://support.symphony.com/hc/en-us/articles/21580125574420-Import-Let-s-Encrypt-certificates-for-GCP-Platform-into-truststore

Can you please advise how to setup in java code in order to import both cert? And do we need to upgrade to newer version like 2.2.0?

Thank you very much.

Regards,
Wing