open_remote completely fails. TypeError in decode_hex due to encrypted URL field. #55

Description

There is a major issue in the repository that causes the application to crash when calling open_remote on a vault due to Lastpass beginning to encrypt the URL field of sites. https://www.bleepingcomputer.com/news/security/lastpass-is-now-encrypting-urls-in-password-vaults-for-better-security/

Steps to Reproduce

1. On the Lastpass website, update a site (such as its password)
2. call lastpass.Vault.open_remote(username, password)
3. TypeError

Expected Behavior

The open_remote call should not throw a TypeError

Actual Behavior

The open_remote call throws a TypeError

Pull request to attempt a decrypt else decode
#54