Update README.md

Author: uerceg

README.md

@@ -197,6 +197,8 @@ compile 'com.google.android.gms:play-services-analytics:10.0.1'
 
 To check whether the analytics part of the Google Play Services library has been successfully added to your app so that the Adjust SDK can read it properly, you should start your app by configuring the SDK to run in `sandbox` mode and set the log level to `verbose`. After that, track a session or some events in your app and observe the list of parameters in the verbose logs which are being read once the session or event has been tracked. If you see a parameter called `gps_adid` in there, you have successfully added the analytics part of the Google Play Services library to your app and our SDK is reading the necessary information from it.
 
+In case you encounter any issue with attempts to read Google Advertising Identifier, feel free to open an issue in our Github repository or write an email to [email protected].
+
 ### <a id="android-proguard"></a>Proguard settings
 
 If you are using Proguard, add these lines to your Proguard file:
@@ -213,20 +215,6 @@ If you are using Proguard, add these lines to your Proguard file:
     java.lang.String getId();
     boolean isLimitAdTrackingEnabled();
 }
--keep class dalvik.system.VMRuntime {
-    java.lang.String getRuntime();
-}
--keep class android.os.Build {
-    java.lang.String[] SUPPORTED_ABIS;
-    java.lang.String CPU_ABI;
-}
--keep class android.content.res.Configuration {
-    android.os.LocaleList getLocales();
-    java.util.Locale locale;
-}
--keep class android.os.LocaledList {
-    java.util.Locale get(int);
-}
 -keep public class com.android.installreferrer.** { *; }
 ```