Can't use HttpCore 5 SNAPSHOT and HttpClient 5 SNAPSHOT together

[Gary Gregory]

Hi All:

Since we've changed the name of GracefullyCloseable to ModalCloseable, one
cannot use HttpCore 5 SNAPSHOT and HttpClient 5 SNAPSHOT (or beta) together.

To remedy this at least temporarily until the next HttpCore beta is out, I
plan on updating HttpClient 5 SNAPSHOT to use HttpCore 5 SNAPSHOT instead
of beta2.

Gary