Minor cleanup

Author: vojtapol

src/main/kotlin/graphql/kickstart/tools/SchemaParser.kt

@@ -184,7 +184,7 @@ class SchemaParser internal constructor(
 
         builder.withDirectives(*buildDirectives(definition.directives, setOf(), Introspection.DirectiveLocation.INPUT_OBJECT))
 
-        extensionDefinitions.plus(definition).forEach {
+        (extensionDefinitions + definition).forEach {
             it.inputValueDefinitions.forEach { inputDefinition ->
                 val fieldBuilder = GraphQLInputObjectField.newInputObjectField()
                         .name(inputDefinition.name)

src/test/groovy/graphql/kickstart/tools/SchemaClassScannerSpec.groovy

@@ -177,11 +177,13 @@ class SchemaClassScannerSpec extends Specification {
                     extend input UserInput {
                         password: String
                     }
-                '''.stripIndent())
-                .resolvers(new GraphQLMutationResolver() {
-                    boolean save(Map map) { true }
-                }, new GraphQLQueryResolver() {
-                })
+                ''')
+                .resolvers(
+                        new GraphQLMutationResolver() {
+                            boolean save(Map map) { true }
+                        },
+                        new GraphQLQueryResolver() {}
+                )
                 .scan()
 
         then: