Updated socket options, added credential provider bindings.

aws_credentials_provider binding (#90)

Only exposing "default chain" and "static" providers for now

Python 2 fixes (2)

bug in distribution scripts prevented release of 0.3.2

Python 2 fixes

Fix mysterious python 2 crash (#87)

- fix mysterious python 2 crash
- add regression test for mysterious python 2 crash
- fix actual mis-use of PyWeakref_GetObject()
- bump version#

Support for MQTT resubscribe (2)

s2n -> 4675f78 (2019.09.13) (#84)

0.3.0 failed to deploy.
We believe we've fixed the AL2-ARM machine that failed.
Bump version and try again.

Also update dependencies;
s2n -> 4675f78 (2019.09.13)
aws-c-mqtt -> v0.4.10

Support for MQTT resubscribe

MQTT Resubscribe (#82)

MQTT changes:
- added `mqtt.Connection.resubscribe_to_existing_topics()`
- `clean_session` flag is no longer ignored
- interrupted/resumed callbacks take additional `connection` arg
- Detect when server rejects the subscription

HTTP changes:
- `HttpStream.completion_future.result()` returns status_code instead of None 

Update dependencies:
- aws-c-common v0.4.12
- aws-c-io v0.4.12
- aws-c-mqtt to v0.4.9

fix python 2 build.

v0.2.28

fix python 2 (#81)

Updates to latest aws-c-* libraries.

Update dependencies to latest (#80)

* aws-c-common v0.4.12
aws-c-io v0.4.11
aws-c-mqtt v0.4.7

* adapt to API spelling change

v0.2.26

Update version in setup.py (#71)

Fixed elasticurl, improved tls options, fixed legacy compiler builds.

v0.2.25

tests for TlsConnectionOptions, alpn_list is now actually a list (#69)

Updates against latest master revision for the common runtime packages.

ClientTlsContext tests and rename-o-rama (#68)

The arguments to these functions confused me so I renamed them.