[Feature] Update names and links of Google & Firebase services.

Author: zhanghai

PRIVACY.md

@@ -16,9 +16,9 @@ The app does use third party services that may collect information used to ident
 
 Link to privacy policy of third party service providers used by the app
 
-- [Google Play Services](https://www.google.com/policies/privacy/)
-- [Firebase Analytics](https://firebase.google.com/policies/analytics)
-- [Crashlytics](http://try.crashlytics.com/terms/privacy-policy.pdf)
+- [Google Play Services](https://policies.google.com/privacy)
+- [Google Analytics for Firebase](https://policies.google.com/privacy)
+- [Firebase Crashlytics](https://firebase.google.com/support/privacy)
 
 ## Log Data