Fixes crash with placeholder vector

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/message/RocketChatMessageAttachmentsLayout.java

@@ -5,6 +5,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Build;
+import android.support.graphics.drawable.VectorDrawableCompat;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
@@ -132,7 +133,7 @@ public class RocketChatMessageAttachmentsLayout extends LinearLayout {
         .downloader(getDownloader())
         .build()
         .load(absolutize(imageURL))
-        .placeholder(R.drawable.image_dummy)
+        .placeholder(VectorDrawableCompat.create(getResources(), R.drawable.image_dummy, null))
         .error(R.drawable.image_error)
         .into((ImageView) attachmentView.findViewById(R.id.image));