Fix the example in README.md

[aybehrouz]

Unfortunately, the example in README.md still does not compile. Apparently BN254 has a ScalarField() method now, and should not be passed as a parameter directly.

[ivokub]

@gbotrel - It is README only change. I think can be merged into master but pinging to be sure that it won't invoke any automatic releases etc.

[gbotrel]

Yep it's fine 👍 thanks for the PR. We should probably find a way to have these examples in a _test.go file to ensure we update them, not the first time...

[ivokub]

Yep it's fine 👍 thanks for the PR. We should probably find a way to have these examples in a _test.go file to ensure we update them, not the first time...

Yep. Maybe we could use package documentation for the actual README, where the examples are documentation examples (Example... function in test files) and then use https://pkg.go.dev/github.com/posener/goreadme to compile into README.md.

Only ugly part with it is that then Go package documentation site has duplicate content (pkg.go.dev/...)

[aybehrouz]

Also, this Github Action from the marketplace could be useful, though I don't know if using it is safe or not:

https://github.com/marketplace/actions/markdown-embed-code-from-file