Authorized keys not getting backed up

[gbeall78]

Line 78 of https://github.com/serverauth-com/serverauth-agent/blob/master/src/cmd/add.go
need to be changed from:

backupKeysFile := keysDir + "/.ssh/authorized_keys.bak"

To

backupKeysFile := keysDir + "/authorized_keys.bak"

[rickmills]

Thanks @gbeall78 we'll get a fix up for this soon (happy to accept a PR if someone gets to it before I do).

[rickmills]

Fixed in v1.0.1