Fix typos in CHANGELOG.md

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (fb5b384) 76.24% compared to head (c703dfa) 76.24%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #245 +/- ## ======================================= Coverage 76.24% 76.24% ======================================= Files 11 11 Lines 783 783 ======================================= Hits 597 597 Misses 186 186 ``` | [Flag](https://app.codecov.io/gh/JuliaTesting/Aqua.jl/pull/245/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaTesting) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/JuliaTesting/Aqua.jl/pull/245/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaTesting) | `76.24% <ø> (ø)` | | 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=JuliaTesting#carryforward-flags-in-the-pull-request-comment) to find out more.

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