Add wintun adapter fix to README.md

[Serock3]

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This change is 

[raksooo]

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CHANGELOG.md line 35 at r1 (raw file):

### Fixed
#### Windows
- Add potential fix for a rare error when creating the Mullvad Wintun-adapter for OpenVPN

It was included in the beta right? I suggest we add it to "Fixed" in the 2024.6-beta1 section.

[Serock3]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @raksooo)

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CHANGELOG.md line 35 at r1 (raw file):

Previously, raksooo (Oskar Nyberg) wrote…

It was included in the beta right? I suggest we add it to "Fixed" in the 2024.6-beta1 section.

Good catch, fixed

[raksooo]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[raksooo]

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved