(using v6.0.2)
We are about to use this in production and we noticed that when passing an invalid certificate it panics. This can cause unexpected failures at runtimes, and i saw that #616 was marked as closed but it does not seem to be.

There are three log.Fatal in the codebase:

• config.go line 325: "Failed to parse certificate"
• server.go line 112 and line 151

I wonder why the error cannot bubble up to the NewClient because that now returns an error.

Are we missing something? Thanks in advance