[FSSDK-8581] chore: Prepare for 4.0.0 release

[mikechu-optimizely]

Summary

• Incremement version numbers removing the beta tag
• Update changelog, readme.md, & license

Test plan

• All unit and e2e test suites should pass

Issues

• FSSDK-8581

[mikechu-optimizely]

LGTM. Just a quick thought, shouldn't we need to update the readme file?

That's a good question. What are you and @jaeopt adding/updating to the README.md?

[muzahidul-opti]

LGTM. Just a quick thought, shouldn't we need to update the readme file?

That's a good question. What are you and @jaeopt adding/updating to the README.md?

For mobile suit, sample api and version need to be updated.

[mikechu-optimizely]

Ah yes. I see you have a version number in the Swift SDK README.md then searching I see that the C# SDK has a version number that's not been updated since 3.2 😬 .

I'll update that and the SDK Deployment runbook. Thanks.

[jaeopt]

LGTM. Just a quick thought, shouldn't we need to update the readme file?

That's a good question. What are you and @jaeopt adding/updating to the README.md?

We can consider adding a line what his major release about. They can look at the release note, but one line of summary will be helpful.

[mikechu-optimizely]

That's a good question. What are you and @jaeopt adding/updating to the README.md?

We can consider adding a line what his major release about. They can look at the release note, but one line of summary will be helpful.

What's the copy for the README one-liner addition? Will it age well with the 4.x.x?