Release version 0.7.3

Changes from 0.7.2:

New Features
---

- Hybrid solvers support (#378):
  - `dwave.cloud.hybrid.Client` is a new client type specialized
    for SAPI hybrid solvers
  - `Solver.hybrid` is a new derived property, also available for
    feature-based solver filtering
- Client certificate SAPI authentication supported via `client_cert`
  and `client_cert_key` config/kwarg parameters (#382)
- `dwave install` now supports `--upgrade` option to (re)install
  partially installed contrib packages, or upgrade stale
  requirements (#381)

Fixes
---

- `qpu`/`sw`/`hybrid` derived solver properties refactored to use
  the new SAPI solver property, `category`
- Nested exception properly propagated by `Future.exception()`
- `dwave install` now enforces the full requirement specifier for
  each contrib dependency
- User home and environment variables are now expanded in
  config file path (#318)

Changes
---

- `Solver.is_*` properties scheduled for removal in 0.8.0
- `Future.error` deprecated in favor of `Future.exception()` and
  scheduled for removal in 0.9.0
- Removed most of Python 2 constructs

dwave/cloud/package_info.py

@@ -14,7 +14,7 @@
 
 __packagename__ = 'dwave-cloud-client'
 __title__ = 'D-Wave Cloud Client'
-__version__ = '0.7.2'
+__version__ = '0.7.3'
 __author__ = 'D-Wave Systems Inc.'
 __description__ = 'A minimal client for interacting with D-Wave cloud resources.'
 __url__ = 'https://github.com/dwavesystems/dwave-cloud-client'