Support for React 18

Hi @rajinwonderland , I got this warning when I tried to install this package: ``` react-code-snippet 0.6.13 └─┬ react-highlight 0.12.0 ├── ✕ unmet peer react@"^15.0.0 || ^16.0.0": found 18.2.0 └── ✕ unmet peer react-dom@"^15.0.0 || ^16.0.0": found 18.2.0 ``` Is this package compatible with React 18?