fix: improve error handling for URLs without scheme #674
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While using oha, I found that it panics when given a URL without a scheme (e.g., localhost:4221 instead of http://localhost:4221).
Instead of a friendly error message, we get this panic:
![image](https://private-user-images.githubusercontent.com/104838272/406615079-b90cf719-0a81-413f-8157-3e5d71aba676.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Mzg5OTMzNTMsIm5iZiI6MTczODk5MzA1MywicGF0aCI6Ii8xMDQ4MzgyNzIvNDA2NjE1MDc5LWI5MGNmNzE5LTBhODEtNDEzZi04MTU3LTNlNWQ3MWFiYTY3Ni5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMjA4JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDIwOFQwNTM3MzNaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT00NDVjNjQwYzZlMDU2YjBiZGUwNzdhNjBkYzM1OGNkNTE5MjlhOGM0ZjNiNjlkMjE4M2MxMDkwZWQyMjhkZWE5JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.Qdv3OmOhX2zeehNX_nYdSeOpKqCIJWl62Zlm-MgGrW8)
Proposed Change
I tried to make this a bit more user-friendly by: