Remove obsolete information from the README (#2321)

`swift package generate-xcodeproj` is deprecated for a long time and Xcode 11 is available for over 3 years.
`swift test --parallel` is the default.
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David Nadoba 2022-11-22 17:32:42 +01:00 committed by GitHub
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@ -284,15 +284,9 @@ echo "Hello SwiftNIO" | nc localhost 9999
If all goes well, you'll see the message echoed back to you.
To work on SwiftNIO in Xcode 11+, you can just open the `Package.swift`
To work on SwiftNIO in Xcode, you can just open the `Package.swift`
file in Xcode and use Xcode's support for SwiftPM Packages.
If you want to develop SwiftNIO with Xcode 10, you have to generate an Xcode project:
```bash
swift package generate-xcodeproj
```
### An alternative: using `docker-compose`
Alternatively, you may want to develop or test with `docker-compose`.
@ -377,10 +371,3 @@ dnf install swift-lang /usr/bin/nc /usr/bin/lsof /usr/bin/shasum
[repo-nio-ssl]: https://github.com/apple/swift-nio-ssl
[repo-nio-transport-services]: https://github.com/apple/swift-nio-transport-services
[repo-nio-ssh]: https://github.com/apple/swift-nio-ssh
### Speeding up testing
It's possible to run the test suite in parallel, it can save significant time if you have a larger multi-core machine, just add `--parallel` when running the tests. This can speed up the run time of the test suite by 30x or more.
```
swift test --parallel
```