Switch from 180 -> 90 day expiration.

// FREEBIE

src/org/thoughtcrime/securesms/util/Util.java

@@ -306,7 +306,7 @@ public class Util {
   }
 
   public static boolean isBuildFresh() {
-    return BuildConfig.BUILD_TIMESTAMP + TimeUnit.DAYS.toMillis(180) > System.currentTimeMillis();
+    return BuildConfig.BUILD_TIMESTAMP + TimeUnit.DAYS.toMillis(90) > System.currentTimeMillis();
   }
 
   @TargetApi(VERSION_CODES.LOLLIPOP)