Updated README.md based on personal testing

[cassieesposito]

ca.protonvpn.udp worked out of the box pulling directly from dockerhub

Breaking change

None

Proposed change

Updating documentation to match improvements in the code base

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New provider (thank you!)
• [ X ] Updated provider (thank you!)
• New feature (which adds functionality to a provider script/repo usage)
• Breaking change (fix/feature causing existing functionality to break)

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: relates to #
• Link to documentation updated (if done separately): https://...

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• [ X ] This PR only modifies documentation

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated