Use single quotes around URL

[paulRbr]

This change adds single quotes around the URL of the curl command.

It makes sure to make curl commands with a URL that contains multiple query param work well in *nix terminals.

e.g. curl http://example.com?query=one&query=two the terminal will interpret the & character as a “send to background” command. See this SO thread for details

[albertodeago]

Hello, thanks for your contribution, may I ask you to check this, tests would need to be updated (I just added a workflow to run them on PRs so it's easier to see the issue)