Invalid example in README

The Python script in `README.md` has two errors:

- missing `import os` at the top
- unquoted `web` on this line:
  ```python
      type = web # str | Enrich a search query with results pulled from Kagi indexes. (default to web)
  ```
  should be:
  ```python
      type = 'web' # str | Enrich a search query with results pulled from Kagi indexes. (default to 'web')
  ```