Make calculateSchema method public. Fixes #455.

Author: bnasslahsen

Diff for: springdoc-openapi-common/src/main/java/org/springdoc/core/GenericResponseBuilder.java

@@ -255,7 +255,7 @@ private Type getReturnType(Method method) {
 		return returnType;
 	}
 
-	private Schema<?> calculateSchema(Components components, Type returnType, JsonView jsonView) {
+	public Schema<?> calculateSchema(Components components, Type returnType, JsonView jsonView) {
 		if (isVoid(returnType)) {
 			// if void, no content
 			return null;