Fixed minimum constraint for RationalNumber

Author: peldax

src/RationalNumberInput.php

@@ -28,7 +28,7 @@ protected function getFieldDefinition() : \Graphpinator\Typesystem\Argument\Argu
                 \Graphpinator\Typesystem\Container::Int()->notNull(),
             )->addDirective(
                 $this->constraintDirectiveAccessor->getInt(),
-                ['min' => 0],
+                ['min' => 1],
             ),
         ]);
     }

src/RationalNumberType.php

@@ -43,7 +43,7 @@ static function(\stdClass $number) : int {
                 },
             )->addDirective(
                 $this->constraintDirectiveAccessor->getInt(),
-                ['min' => 0],
+                ['min' => 1],
             ),
         ]);
     }