v2: remove error from CACerts() signature

[dolmen]

Parsability of the certificates should be checked by the unit test.
At runtime this check is supposed to have passed, so no error should occur in AppendCertsFromPEM and any error happening is a problem that should have been caught at build time of the program embedding gocertifi and reporting such error as panic would be appropriate.

[mattrobenolt]

I do agree with this, but I'd rather not roll in and make a breaking API change right now. You are right though. :)

[mattrobenolt]

59a85de is heading towards this direction.

[tmm1]

👍 This would make usage a lot simpler when setting up http clients/transports.