apollo-compiler@1.0.0-beta.17

Fixes

• Fix validation performance bug - goto-bus-stop in issue/862, pull/863
  Adds a cache in fragment spread validation, fixing a situation where validating a query
  with many fragment spreads against a schema with many interfaces could take multiple
  seconds to validate.

Maintenance

• Remove ariadne byte/char mapping - goto-bus-stop in pull/855
  Generating JSON or CLI reports for apollo-compiler diagnostics used a translation layer
  between byte offsets and character offsets, which cost some computation and memory
  proportional to the size of the source text. The latest version of ariadne allows us to
  remove this translation.