Add writeConcern to Delete and Update

src/Operation/Delete.php

@@ -127,7 +127,13 @@ class Delete implements Executable, Explainable
 
     public function getCommandDocument()
     {
-        return ['delete' => $this->collectionName, 'deletes' => [['q' => $this->filter] + $this->createDeleteOptions()]];
+        $cmd = ['delete' => $this->collectionName, 'deletes' => [['q' => $this->filter] + $this->createDeleteOptions()]];
+
+        if (isset($this->options['writeConcern'])) {
+            $cmd['writeConcern'] = $this->options['writeConcern'];
+        }
+
+        return $cmd;
     }
 
     /**

src/Operation/Explainable.php

@@ -17,8 +17,6 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\Driver\Server;
-
 /**
  * Explainable interface for explainable operations (count, distinct, find,
  * findAndModify, delete, and update).

src/Operation/Update.php

@@ -183,7 +183,17 @@ class Update implements Executable, Explainable
 
     public function getCommandDocument()
     {
-        return ['update' => $this->collectionName, 'updates' => [['q' => $this->filter, 'u' => $this->update] + $this->createUpdateOptions()]];
+        $cmd = ['update' => $this->collectionName, 'updates' => [['q' => $this->filter, 'u' => $this->update] + $this->createUpdateOptions()]];
+
+        if (isset($this->options['writeConcern'])) {
+            $cmd['writeConcern'] = $this->options['writeConcern'];
+        }
+
+        if (isset($this->options['bypassDocumentValidation']) && \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)) {
+            $cmd['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
+        }
+
+        return $cmd;
     }
 
     /**