fix readme links

Author: zihejia

README.md

@@ -91,17 +91,17 @@ Yes, in Lexicon, you can intercept and drop incoming events or properties. Mixpa
 
 **I have a test user I would like to opt out of tracking. How do I do that?**
 
-Mixpanel’s client-side tracking library contains the  [optOutTracking()](https://mixpanel.github.io/mixpanel-react-native/Mixpanel.html#optOutTracking)  method, which will set the user’s local opt-out state to “true” and will prevent data from being sent from a user’s device. More detailed instructions can be found in the section,  [Opting users out of tracking](https://developer.mixpanel.com/docs/react-native#opting-users-out-of-tracking).
+Mixpanel’s client-side tracking library contains the  [optOutTracking()](https://mixpanel.github.io/mixpanel-flutter/mixpanel_flutter/Mixpanel/optOutTracking.html)  method, which will set the user’s local opt-out state to “true” and will prevent data from being sent from a user’s device. More detailed instructions can be found in the section,  [Opting users out of tracking](https://developer.mixpanel.com/docs/flutter#opting-users-out-of-tracking).
 
 **Why aren't my events showing up?**
 
-To preserve battery life and customer bandwidth, the Mixpanel library doesn't send the events you record immediately. Instead, it sends batches to the Mixpanel servers every 60 seconds while your application is running, as well as when the application transitions to the background. You can call  [flush()](https://mixpanel.github.io/mixpanel-react-native/Mixpanel.html#flush)  manually if you want to force a flush at a particular moment.
+To preserve battery life and customer bandwidth, the Mixpanel library doesn't send the events you record immediately. Instead, it sends batches to the Mixpanel servers every 60 seconds while your application is running, as well as when the application transitions to the background. You can call  [flush()](https://mixpanel.github.io/mixpanel-flutter/mixpanel_flutter/Mixpanel/flush.html)  manually if you want to force a flush at a particular moment.
 
 ```
 mixpanel.flush();
 ```
 
-If your events are still not showing up after 60 seconds, check if you have opted out of tracking. You can also enable Mixpanel debugging and logging, it allows you to see the debug output from the Mixpanel library. To enable it, call  [setLoggingEnabled](https://mixpanel.github.io/mixpanel-react-native/Mixpanel.html#setLoggingEnabled)  to true, then run your iOS project with Xcode or android project with Android Studio. The logs should be available in the console.
+If your events are still not showing up after 60 seconds, check if you have opted out of tracking. You can also enable Mixpanel debugging and logging, it allows you to see the debug output from the Mixpanel library. To enable it, call  [setLoggingEnabled](https://mixpanel.github.io/mixpanel-flutter/mixpanel_flutter/Mixpanel/setLoggingEnabled.html)  to true, then run your iOS project with Xcode or android project with Android Studio. The logs should be available in the console.
 
 ```
 mixpanel.setLoggingEnabled(true);