Bump version to 1.8.0 to reflect recent features and bug fixes

[Copilot]

This PR updates the version number from 1.7.0 to 1.8.0 across all relevant files to reflect the significant new features and bug fixes that have been added since the 1.7.0 release.

Changes Made

The following files have been updated with the new version number:

• composer.json: Updated version field from "1.7.0" to "1.8.0"
• src/OneLoginClient.php: Updated VERSION constant from "1.7.0" to "1.8.0"
• README.md: Updated documentation header to reflect version 1.8.0 and added changelog noting bug fixes

Why 1.8.0?

Since the 1.7.0 release, several important updates have been merged:

• Exception handling support for API errors (backward compatible)
• Bug fixes for otp_devices API compatibility
• Support disclaimers and documentation improvements
• Various other enhancements

These constitute minor version changes (new features with backward compatibility) according to semantic versioning, making 1.8.0 the appropriate next version.

Validation

• ✅ All version constants are correctly updated and consistent
• ✅ User agent string reflects new version
• ✅ composer.json syntax is valid
• ✅ No breaking changes to existing functionality

Fixes #30.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/guzzle/promises/zipball/67ab6e18aaa14d753cc148911d273f6e6cb6721e
  • Triggering command: /usr/bin/php8.3 -n -c /tmp/DglD4M /usr/bin/composer install (http block)
• https://api.github.com/repos/ralouphie/getallheaders/zipball/120b605dfeb996808c31b6477290a714d356e822
  • Triggering command: /usr/bin/php8.3 -n -c /tmp/DglD4M /usr/bin/composer install (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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