Fix file links

README.md

@@ -62,7 +62,7 @@ If you want to use Google's XOAUTH2 authentication mechanism, you need to be run
 
 ### Minimal installation
 
-While installing the entire package manually or with composer is simple, convenient and reliable, you may want to include only vital files in your project. At the very least you will need [class.phpmailer.php](https://github.com/PHPMailer/PHPMailer/class.phpmailer.php). If you're using SMTP, you'll need [class.smtp.php](https://github.com/PHPMailer/PHPMailer/class.smtp.php), and if you're using POP-before SMTP, you'll need [class.pop3.php](class.pop3.php). For all of these, we recommend you use [the autoloader](https://github.com/PHPMailer/PHPMailer/PHPMailerAutoload.php) too as otherwise you will either have to `require` all classes manually or use some other autoloader. You can skip the [language](https://github.com/PHPMailer/PHPMailer/language/) folder if you're not showing errors to users and can make do with English-only errors. You may need the additional classes in the [extras](extras/) folder if you are using those features, including NTLM authentication and ics generation. If you're using Google XOAUTH2 you will need `class.phpmaileroauth.php` and `class.oauth.php` classes too, as well as the composer dependencies.
+While installing the entire package manually or with composer is simple, convenient and reliable, you may want to include only vital files in your project. At the very least you will need [class.phpmailer.php](https://github.com/PHPMailer/PHPMailer/tree/master/class.phpmailer.php). If you're using SMTP, you'll need [class.smtp.php](https://github.com/PHPMailer/PHPMailer/tree/master/class.smtp.php), and if you're using POP-before SMTP, you'll need [class.pop3.php](https://github.com/PHPMailer/PHPMailer/tree/master/class.pop3.php). For all of these, we recommend you use [the autoloader](https://github.com/PHPMailer/PHPMailer/tree/master/PHPMailerAutoload.php) too as otherwise you will either have to `require` all classes manually or use some other autoloader. You can skip the [language](https://github.com/PHPMailer/PHPMailer/tree/master/language/) folder if you're not showing errors to users and can make do with English-only errors. You may need the additional classes in the [extras](extras/) folder if you are using those features, including NTLM authentication and ics generation. If you're using Google XOAUTH2 you will need `class.phpmaileroauth.php` and `class.oauth.php` classes too, as well as the composer dependencies.
 
 ## A Simple Example