R1:8bbc7242104f

Bump Conduit server version

Summary:
We introduced a "user.query" call recently which is only about two weeks old. Bump versions so users get a forced upgrade.

Also, we raise a fairly confusing message when the user calls a nonexistent method. This is not the intent; `class_exists()` throws. Tailor this exception more carefully.

Test Plan:
- Ran `echo {} | arc call-conduit derp.derp`, got a better exception.
- Bumped version, ran `arc list`, got told to upgrade.

Reviewers: indiefan, nh, vrana…