Fix typings (extend vue instead of @vue/runtime-core)

[felixgabler]

Changes in PR:

Switched to extending vue instead of @vue/runtime-core as recommended in the official docs. Currently, it breaks type checking and throws a lot of type errors when this library is included.

https://vuejs.org/guide/extras/web-components#web-components-and-typescript

Also, it would be great if dependencies could be updated. @kyvg let me know if you'd like me to open another PR for it but I don't know if there are any restrictions or things to watch out for with this library.

[cr-gpt]

Code Review:

1. Import Statement:

   • Make sure that the path to the notify function in the import statement (import { notify } from './index';) is correct and leads to the intended definition.

2. Module Declaration:

   • The change in module declaration from '@vue/runtime-core' to 'vue' might be incompatible if the actual implementation relies on Vue 3's @vue/runtime-core. Ensure this change is intentional and won't break other parts of your application using Vue 3.

3. Type Definition:

   • Verify that the $notify property is correctly added to the Vue instance for usage.

4. Consistency:

   • Ensure consistency with other type/declaration files and conventions used in your project.

5. Testing:

   • Test to ensure that the notifications work as expected after this change.

6. Documentation:

   • Add comments or documentation to explain why this specific module declaration change was made for future reference.

Suggestions for Improvement:

• If possible, provide more context on what notify does and how it should be handled within the Vue component.

Bug Risks:

• The primary concern would be the potential breaking changes of module declaration if 'vue' doesn't incorporate the necessary types or interfaces you need to extend. Double-check compatibility with the version of Vue you are using.

By addressing these points, you can enhance the clarity, maintainability, and compatibility of the code.

[kyvg]

Thank you for your PR! I'll try to update dependencies this weekend

[felixgabler]

Awesome! Looking forward to the next release