Merge pull request #149 from inxilpro/settledresult-throw-bc-fix

Add default value for `$numberOfBacktraces` in `SettledResult::throw`

Author: inxilpro

src/Results/SettledResult.php

@@ -99,15 +99,15 @@ public function toResponse($request)
      *
      * @throws Exception
      */
-    public function throw(?int $numberOfBacktraces)
+    public function throw(?int $numberOfBacktraces = null)
     {
         if (!$this->isError()) {
             return $this;
         }
 
         throw new LambdaExecutionException(sprintf('Lambda Execution Exception for %s: "%s".', ...[
             get_class($this->function),
-            $this->errorAsString($numberOfBacktraces)
+            $this->errorAsString($numberOfBacktraces ?? 2)
         ]));
     }