Reject desktop clients older than 2.0.27 #64
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Since merging #28, AnkiServer uses a backwards-incompatible version of the sync protocol. To prevent confusing (or silent) errors, the server should just disallow connections from older clients.
As an extra, the server compares the version correctly (2.1.0 > 2.0.41) and no longer assumes that an unknown client uses the pre-2.0.13 protocol, which is now wrong in most cases, as can be seen in #63.
Fixes #60.