Fix README documentation examples for obfuscator methods

[Copilot]

Addressed two issues in the obfuscator documentation examples where methods were incorrectly called on the package instead of the logger instance.

Changes:

• Fixed logger.Obfuscate() → log.Obfuscate() to call method on logger instance
• Fixed logger.Unobfuscate() → log.Unobfuscate() with proper error handling for the (string, error) return signature

Corrected example:

log := logger.Create("MYAPP", cipherBlock)

data, err := log.Unobfuscate(obfuscatedData)
if err != nil {
    fmt.Printf("failed to unobfuscate data: %v", err)
} else {
    fmt.Printf("Here is the data: %s", data)
}

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[Copilot]

Pull request overview

This PR corrects the README’s obfuscation documentation examples so they call Obfuscate/Unobfuscate on the *logger.Logger instance (as implemented in code), and updates the Unobfuscate example to handle its (string, error) return.

Changes:

• Updated the Obfuscate example to call log.Obfuscate(...) instead of logger.Obfuscate(...).
• Updated the Unobfuscate example to call log.Unobfuscate(...) and handle the returned error.

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