fix: add space in error message

src/Console/Command/Io/TypifiedInput.php

@@ -22,7 +22,7 @@ public function getStringOption(string $name): string
         $value = $this->input->getOption($name);
         if (!is_string($value)) {
             throw new InvalidArgumentException(
-                'option' . $name . ' must be a string: ' . $value
+                'option ' . $name . ' must be a string: ' . $value
             );
         }
         return $value;