Removed @NonNull annotation from the multi choice callback method in the Builder/AlertDialogWrapper.

library/src/main/java/com/afollestad/materialdialogs/AlertDialogWrapper.java

@@ -126,7 +126,7 @@ public class AlertDialogWrapper {
             return this;
         }
 
-        public Builder setItems(@NonNull CharSequence[] items, DialogInterface.OnClickListener listener) {
+        public Builder setItems(CharSequence[] items, DialogInterface.OnClickListener listener) {
             builder.items(items);
             onClickListener = listener;
             return this;

library/src/main/java/com/afollestad/materialdialogs/MaterialDialog.java

@@ -1209,7 +1209,7 @@ public class MaterialDialog extends DialogBase implements View.OnClickListener {
          * @param callback        The callback that will be called when the presses the positive button.
          * @return The Builder instance so you can chain calls to it.
          */
-        public Builder itemsCallbackMultiChoice(@NonNull Integer[] selectedIndices, @NonNull ListCallbackMulti callback) {
+        public Builder itemsCallbackMultiChoice(Integer[] selectedIndices, @NonNull ListCallbackMulti callback) {
             this.selectedIndices = selectedIndices;
             this.listCallback = null;
             this.listCallbackSingle = null;