Updating to version 0.7

Version 0.7 of Byline Manager fixes a limitation that prevented linking a WordPress user account with a profile on more than one site in the same multisite installation. See #41.

As part of the fix, the user meta key where a linked profile ID is saved is now site-specific in the form of byline_manager_{$blog_prefix}_profile_id'. Existing profile_id meta keys will continue to work, and newly linked profiles will save to the new meta key.

A WP-CLI command is available to migrate all user-to-profile links to the new meta keys in one pass: wp byline-manager migrate-user-meta-to-blog-prefix [--dry-run]. The command affects all the sites in the network (so that it can safely remove all profile_id meta keys), so take care before running it on a large network.