Bump up to v2.3.0

[codecov[bot]]

Codecov Report

Patch coverage: 77.83% and project coverage change: +2.37 :tada:

Comparison is base (5b91134) 74.66% compared to head (b493107) 77.04%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #468 +/- ## ========================================== + Coverage 74.66% 77.04% +2.37% ========================================== Files 15 23 +8 Lines 1508 2418 +910 ========================================== + Hits 1126 1863 +737 - Misses 302 422 +120 - Partials 80 133 +53 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `77.04% <77.83%> (+2.37%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan) | Coverage Δ | | |---|---|---| | [connection\_bsd.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-Y29ubmVjdGlvbl9ic2QuZ28=) | `100.00% <ø> (ø)` | | | [connection\_linux.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-Y29ubmVjdGlvbl9saW51eC5nbw==) | `85.00% <ø> (ø)` | | | [listener\_unix.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-bGlzdGVuZXJfdW5peC5nbw==) | `100.00% <ø> (ø)` | | | [options.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-b3B0aW9ucy5nbw==) | `94.87% <ø> (ø)` | | | [acceptor\_unix.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-YWNjZXB0b3JfdW5peC5nbw==) | `41.37% <5.26%> (ø)` | | | [connection\_unix.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-Y29ubmVjdGlvbl91bml4Lmdv) | `71.20% <63.63%> (ø)` | | | [connection\_windows.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-Y29ubmVjdGlvbl93aW5kb3dzLmdv) | `64.52% <64.52%> (ø)` | | | [load\_balancer.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-bG9hZF9iYWxhbmNlci5nbw==) | `72.97% <68.75%> (-3.82%)` | :arrow_down: | | [gnet.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-Z25ldC5nbw==) | `83.82% <75.00%> (+12.60%)` | :arrow_up: | | [engine\_unix.go](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan#diff-ZW5naW5lX3VuaXguZ28=) | `77.95% <78.57%> (ø)` | | | ... and [13 more](https://app.codecov.io/gh/panjf2000/gnet/pull/468?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan) | |

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