Fix crash in AboutActivity, add Instabug proguard rules.

Author: Paolo Rotolo

app/proguard-rules.pro

@@ -72,6 +72,13 @@
     public static final ** CREATOR;
 }
 
+## Instabug
+-dontwarn org.apache.http.**
+-dontwarn android.net.http.AndroidHttpClient
+-dontwarn com.google.android.gms.**
+-dontwarn com.android.volley.toolbox.**
+-dontwarn com.instabug.**
+
 ## Smooch
 -dontwarn okio.**
 -keep class okio.**

app/src/main/java/org/glucosio/android/activity/AboutActivity.java

@@ -29,6 +29,8 @@
 import android.support.v7.app.AppCompatActivity;
 import android.view.MenuItem;
 
+import com.instabug.library.Instabug;
+
 import org.glucosio.android.GlucosioApplication;
 import org.glucosio.android.R;
 import org.glucosio.android.analytics.Analytics;
@@ -118,7 +120,7 @@ public boolean onPreferenceClick(Preference preference) {
             feedbackPref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                 @Override
                 public boolean onPreferenceClick(Preference preference) {
-                    ((MainActivity) getActivity()).openSupportDialog();
+                    Instabug.invoke();
 
                     return false;
                 }