Fix linting issues

[pajlada]

Pull request checklist:

• [x] CHANGELOG.md was updated, if applicable

Description

• Make use of newConnectionManager instead of creating the struct ourselves
• Remove unneccesary loop in connectionManager.run

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 :tada:

Comparison is base (fecd897) 1.03% compared to head (917ec8b) 1.05%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #18 +/- ## ========================================= + Coverage 1.03% 1.05% +0.01% ========================================= Files 12 12 Lines 577 568 -9 ========================================= Hits 6 6 + Misses 570 561 -9 Partials 1 1 ``` | [Impacted Files](https://app.codecov.io/gh/pajlada/go-twitch-pubsub/pull/18?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pajlada) | Coverage Δ | | |---|---|---| | [client.go](https://app.codecov.io/gh/pajlada/go-twitch-pubsub/pull/18?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pajlada#diff-Y2xpZW50Lmdv) | `0.00% <0.00%> (ø)` | | | [connectionmanager.go](https://app.codecov.io/gh/pajlada/go-twitch-pubsub/pull/18?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pajlada#diff-Y29ubmVjdGlvbm1hbmFnZXIuZ28=) | `0.00% <0.00%> (ø)` | |

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