Update README.md

Add note regarding Google Analytics to the Data Privacy section

Author: wheaney

README.md

@@ -109,6 +109,7 @@ In order to provide you with Supporter Tier features, this application and its b
 * Your email address is sent to this application's backend server from either the payment vendor (Ko-fi) or from your device (at your request). Your email address may be used immediately upon receipt in its unaltered form to send you a transactional email, but it is then hashed prior to storage. The unaltered form of your email address is never stored and can no longer be referenced. The hashed value is stored for later reference.
   * Other personal data may be sent from the payment vendor, but is never utilized nor stored. 
 * Your device's MAC address is hashed on your device. It never leaves your device in its original, unaltered form. The hashed value is sent to this application's backend server and stored for later reference.
+* Metrics are collected using Google Analytics. No personal information is explicitly collected, and Google Analytics will anonymize the IP address that's sent as part of the HTTP request.
 
 Hashing functions are a one-way process that serve to anonymize your personal data by irreversibly changing them. Once hashed, they can never be unhashed or traced back to their original values.