How is tls=true useful?

[aaronkavlie-wf]

Issue description

The tls param can be enabled with a custom value, or just true.
It doesn't seem that it's possible to modify the config if set to true, and I'm having trouble figuring out how that is useful. It doesn't appear possible to use a blank config.

Error log

The tls package produced this error on attempt to connect to Amazon Aurora with tls=true:

either ServerName or InsecureSkipVerify must be specified in the tls.Config

Configuration

Driver version (or git SHA):

Go version: go1.7.4 darwin/amd64

Server version: Amazon Aurora

[dveeden]

#564 also deals with this issue

[julienschmidt]

Fixed by #564