xkcd: Change search engine from Duckduckgo to Bing

[kwaaak]

For whatever reason Duckduckgo (which is used when it says google_search in this module) does not return results anymore. A quick switch to Bing restores the search function.

[dgw]

DuckDuckGo no longer returns results when multiple site: operators are present in the query, on its plain HTML version (https://duckduckgo.com/html/). The xkcd module uses a bunch of negative -site: operators to try and get comics only, and for whatever reason DDG stopped working for that case.

I reached out to DuckDuckGo via feedback and social media; we'll see if they address it. I consider this ultimately a "bug" in the search module (even though it's not Sopel's fault), but if all else fails and DDG won't address the issue then this patch is a good fallback for the next release.

Thanks for bringing the problem to my attention!

[dgw]

Will work. See #1415 for merge/release plans and further information on the bug that makes this change necessary.

[dgw]

DuckDuckGo isn't showing any signs of even acknowledging the site: bug's existence. Unless they suddenly decide to fix it, this workaround will be released with the next version of Sopel.