fix incorrect type in diff_3

Author: damianw

src/main/java/com/qdesrame/openapi/diff/compare/SchemaDiff.java

@@ -1,30 +1,28 @@
 package com.qdesrame.openapi.diff.compare;
 
+import static java.util.Optional.ofNullable;
+
 import com.qdesrame.openapi.diff.compare.schemadiffresult.ArraySchemaDiffResult;
 import com.qdesrame.openapi.diff.compare.schemadiffresult.ComposedSchemaDiffResult;
 import com.qdesrame.openapi.diff.compare.schemadiffresult.SchemaDiffResult;
 import com.qdesrame.openapi.diff.model.ChangedSchema;
 import com.qdesrame.openapi.diff.model.DiffContext;
 import com.qdesrame.openapi.diff.utils.RefPointer;
 import com.qdesrame.openapi.diff.utils.RefType;
-
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Optional;
-
 import io.swagger.v3.oas.models.Components;
 import io.swagger.v3.oas.models.ExternalDocumentation;
 import io.swagger.v3.oas.models.media.ArraySchema;
 import io.swagger.v3.oas.models.media.ComposedSchema;
 import io.swagger.v3.oas.models.media.Discriminator;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.media.XML;
-
-import static java.util.Optional.ofNullable;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
 
 public class SchemaDiff extends ReferenceDiffCache<Schema, ChangedSchema> {
 

src/test/java/com/qdesrame/openapi/test/AllOfDiffTest.java

@@ -1,10 +1,10 @@
 package com.qdesrame.openapi.test;
 
-import org.junit.jupiter.api.Test;
-
 import static com.qdesrame.openapi.test.TestUtils.assertOpenApiAreEquals;
 import static com.qdesrame.openapi.test.TestUtils.assertOpenApiChangedEndpoints;
 
+import org.junit.jupiter.api.Test;
+
 /** Created by adarsh.sharma on 19/12/17. */
 public class AllOfDiffTest {
 

src/test/resources/allOf_diff_3.yaml

@@ -107,7 +107,7 @@ components:
         pet_type:
           nullable: false
           allOf:
-          - type: number
+          - type: string
     Cat:
       description: Cat class
       allOf: