0.8.7

Features

• __lbheartbeat__ will return 500 if the connection pool is exhausted (#997) ([e72573a](https://github.com/mozilla-services/syncstorage-
  rs/commit/e72573acedce2916c9fd3aa8e3c54fbe71f2008e), closes #996)

Chore

• tag 0.8.6 (#995) (8cb5b603)