New features

• Created a starter for Spring Webflux: graphql-kickstart-spring-boot-starter-webflux. Supports subscriptions through websockets, but no support for batched queries at the moment.
• Extracted separate starter for GraphQL Java Tools: graphql-kickstart-spring-boot-starter-tools

Breaking changes

• Upgraded graphql-java-servlet to 9.0.0
• Removed the dependency on commons.io.