updating docs and version for release 0.11.4

[ajmirsky]

Changes included in this PR

• disable TLS certificate verification via config `PR #312
• fix: handle special characters in passwords PR #307
• fix: explicit close/release allowing proper v3.10 cleanup PR #304
• fix: prevent failure when sys_interval is unset or None PR #303
• reduce noisy reconnect logging PR #310
• fix: publish coroutines in client documentation PR #302
• fix: exception names in client documentation PR #305
• fix: amqtt_sub reference page name PR #299
• remove obselete pytests, add additional coverage PR #309

(in docs/changelog.md)

New behavior

everything needed for v0.11.4 release

Impact

no breaking changes

Checklist

1. Does your submission pass the existing tests?
2. Are there new tests that cover these additions/changes?
3. Have you linted your code locally before submission?