Allow usage with react 18

[fzaninotto]

• Update dependencies to use react-18 (not in this PR)
• Update the simple example to use createRoot and test that it works (not in this PR)
• Update the ecommerce example to use createRoot and StrictMode and test that it works (not in this PR)
• Relax react version dependency

[stof]

is it expected to mark versions 1 to +INF as supported in the peerDependencies ? Previously, the code had a 16.9.0 lower bound so I doubt older versions work, and you only tested it with version 19, not with 19+

[fzaninotto]

I must admit that I initially made the following change:

-"react": "^16.9.0 || ^17.0.0",
+"react": "^16.9.0 || ^17.0.0" || "rc",

And prettier updated it to

"react": "*",

I didn't give it more thought, but you're right, this is too broad.

However, if there is a prettier rule that doesn't accept 3 versions, there must be a reason, so this needs investigation.

Would you like to take a look at the problem?

[jchook]

Maybe a version range is appropriate here? e.g. "react": ">=16.9.0 <19.0.0"