Clean up README.md

[lucaswerkmeister]

Fix a typo, update a link to HTTPS and lightly rephrase the first paragraph.

[lucaswerkmeister]

I also suspect there’s a bug in the continuation example:

for portion in continued:
    try:
        if 'query' in portion:
            for page in portion['query']['pages']:
                pages.append(page['title'])
        else:
            print("Mediwiki returned empty result batch.")
    except APIError:
        raise ValueError(
            "MediaWiki returned an error:", str(APIError)
        )

If there is an API error, it wouldn’t be raised in the section guarded by the try, but elsewhere, right? (cc @yurkobb)

[halfak]

Looks good to me.

[halfak]

Thanks for the cleanup!

[lucaswerkmeister]

Thanks for merging!