v1.4.0

• Added nullable flag to ajv config
• Updated dependencies
  • ajv ^6.10.2 → ^6.11.0
  • ajv-oai ^1.1.5 → ^1.2.0
  • swagger-parser ^8.0.3 → ^8.0.4
  • fastify ^2.10.0 → ^2.11.0
  • tap ^14.10.2 → ^14.10.6