apollo-smith@0.3.0

BREAKING

• make conversions from apollo-parser types fallible - goto-bus-stop, pull/371

  The parser-impl feature flag contains conversion code from apollo-parser AST node types
  to apollo-smith types. With this change, those conversions now use the TryFrom trait
  instead of the From trait, and return errors instead of panicking.

  You now have to use the try_from() and try_into() methods instead of from() and
  into().