Add a DuckDuckGo back-end

[Calinou]

Currently, this package relies on Google, which might not be desirable for all users (privacy concerns, filter bubble, …). What about supporting DuckDuckGo as a search back-end? It supports the site: keyword just like Google.

[pizzamaker]

Or searx... https://searx.laquadrature.net/

[rugk]

@pizzamaker Maybe create a new issue for this.
Personally I think DuckDuckGo would be easier for now. (and it is also more widespread)

filter bubble

When searching for code? I mean - or better: I hope - this plugin does not allow Google to save cookies or something, so that you hopefully cannot be tracked in this way. And as you cannot login to Google in Atom they also can't personalize their results using your account information. Additionally I think that filterbubbles rarely matter when searching for code snippets. 😆

Anyway I am 👍 for this issue.