A Conan badge as a proper listing in a registry

[mattkretz]

conan.io is listed as an awesome research software registry: https://github.com/NLeSC/awesome-research-software-registries

Adjust tests and expected test output.

Checklist

• Code follows the contributing guidelines of the project
• This PR solves an existing issue and provided solution was discussed
• The fix has been locally tested
• Code follows the project's coding standards
• Unit tests covering the new feature have been added
• All existing tests pass
• The documentation has been updated to reflect the new feature

List of related issues or pull requests

• conan.io C++ packages need to be recognized as registry #368

Briefly describe the changes made in this pull request

Recognize Conan badge as proper software registry.

Additional Notes

@c-martinez ping

Instructions to review the pull request

Execute pytest as documented in the README. https://github.com/mattkretz/vir-simd is an example repo with Conan badge.

[c-martinez]

As far as I can see, this PR works fine and could be merged.

@fdiblen -- don't know if you would like someone to double check? Otherwise, I think this could be merged.

[fdiblen]

Thank you so much for this contribution, @mattkretz!
I will merge it to avoid any further delays.