SUPPORT-638 : Update README.md

[heyitsbryanm]

Description

Some users were double encoding URLs prior to using the buildUrl function, resulting in double encoding.

Adds double encoding comment to README.

Note that a future solution could be to detect encoding -> prevent double encoding with the buildUrl feature (see this issue)

Checklist

• Read the contributing guidelines.
• Each commit follows the Conventional Commit spec format.
• Update the readme (if applicable).
• Update or add any necessary API documentation (if applicable)
• All existing unit tests are still passing (if applicable).

• Add some steps so we can test your bug fix or feature (if applicable).
• Add new passing unit tests to cover the code introduced by your PR (if applicable).
• Any breaking changes are specified on the commit on which they are introduced with BREAKING CHANGE in the body of the commit.
• If this is a big feature with breaking changes, consider opening an issue to discuss first. This is completely up to you, but please keep in mind that your PR might not be accepted.

[commit-lint]

Contributors

heyitsbryanm

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[luqven]

LGTM 🚢