Add SndLink readiness

[codecov[bot]]

Codecov Report

Patch coverage: 37.50% and project coverage change: -0.02 :warning:

Comparison is base (cf21a64) 48.70% compared to head (b929bb2) 48.69%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #28 +/- ## ========================================== - Coverage 48.70% 48.69% -0.02% ========================================== Files 34 34 Lines 3394 3401 +7 ========================================== + Hits 1653 1656 +3 - Misses 1741 1745 +4 ``` | [Impacted Files](https://codecov.io/gh/ntex-rs/ntex-amqp/pull/28?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ntex-rs) | Coverage Δ | | |---|---|---| | [src/sndlink.rs](https://codecov.io/gh/ntex-rs/ntex-amqp/pull/28?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ntex-rs#diff-c3JjL3NuZGxpbmsucnM=) | `41.41% <37.50%> (-0.13%)` | :arrow_down: | ... and [1 file with indirect coverage changes](https://codecov.io/gh/ntex-rs/ntex-amqp/pull/28/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ntex-rs) Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ntex-rs). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ntex-rs)

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