Fixed bug in release builds where event bus events were not being fired

app/proguard-project.txt

@@ -37,6 +37,12 @@
 -keep public class acr.browser.lightning.reading.*
 -keep class org.lucasr.twowayview.** { *; }
 
+-keepattributes *Annotation*
+-keepclassmembers class ** {
+    @com.squareup.otto.Subscribe public *;
+    @com.squareup.otto.Produce public *;
+}
+
 -assumenosideeffects class android.util.Log {
     public static *** d(...);
     public static *** v(...);