[Bug] If expire is "never" showPasteResponse.meta can not be unmarshalled

[Qrizzle]

With the server: https://paste.cracktek.eu and "expire": "never". The meta json response object can not be unmarshalled.

On privatebin.net, which doesnt support bin, which do not expire:

On paste.cracktek.eu:

[Qrizzle]

Fixed the issue with #38