added spacy-langdetect to universe.json

[Abhijit-2592]

Description

Added spacy-langdetect plugin to universe.json

Checklist

• I have submitted the spaCy Contributor Agreement.
• I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.

[explosion-bot]

Hi @Abhijit-2592, thanks for your pull request! 👍 It looks like you haven't filled in the spaCy Contributor Agreement (SCA) yet. The agrement ensures that we can use your contribution across the project. Once you've filled in the template, put it in the .github/contributors directory and add it to this pull request. If your pull request targets a branch that's not master, for example develop, make sure to submit the Contributor Agreement to the master branch. Thanks a lot!

If you've already included the Contributor Agreement in your pull request above, you can ignore this message.

[ines]

Thanks! No idea why the test failed, looks like a problem with Travis. Since it's only docs changes, I'm happy to merge this 👍

[Abhijit-2592]

@ines Thanks.