LTO support for Clang/GCC

v0.4.4

aws_http_header_type -> aws_http_header_block (#143)

Connection manager shutdown callback + edge cases

Connection manager shutdown callback support (#136)

* Connection manager shutdown callback support

* Dummy change to trigger CI

Library init/cleanup

v0.4.2

Const options (#131)

Manager fixes + proxy configuration additions

Manager proxy (#127)

* connection manager proxy configuration
* websocket proxy configuration

"H1B" API revamp

Merge pull request #125 from awslabs/h1b

Merge H1B to master

HPACK error handling

v0.3.3

trivial hpack error handling (#121)

Fix error info

Remove invalid entry from error info list.

Logging refactor

Update for logging move (#92)

* Update for logging move

Websockets, task logging

• Additional websocket support
• Adds string tags to tasks and task logging for easier identification
• Elasticurl extensions for request signing

Client bootstrap shutdown fixes

Delay failed setup cb until channel shutdown completes (#76)

Edge case was: channel setup succeeded, but something goes wrong creating the HTTP handler. The on_setup() callback should not be invoked until the channel finishes shutting down.