5.10.0

Thanks to the contributors this release contains the following changes:

• Upgraded graphql-java-servlet to 8.0.0
• Upgraded graphql-java-tools to 5.6.1
• Updated sample for argument directive #188
• Added Playground starter as alternative to GraphiQL #212
• GraphiQL "subscriptionsClient.subscribe is not a function" #220
• Setting editorTheme property does not change theme #235
• Path variables in graphql mapping #246
• Introspection-enabled doen't work #247
• Regression in Altrairs altair.static.basePath #252
• GraphiQL starter is not compatible with Spring security #253
• GraphQLErrorHandlerFactory scans for beans with request scope and dies #254
• env.getCodeRegistry() is null #255
• Allowed auto configuration with custom schema provider (fixes #192)