API Gateway ImporterでswaggerのファイルをインポートしてBadRequestExceptionが出た場合の対処

API Gateway ImporterでswaggerのファイルをインポートしてBadRequestExceptionが出た場合の対処

responsesのdescriptionが日本語だとエラーが発生するので英語に変更すればOK
responsesのdescriptionはAPI GatewayのModelsのNameとして利用されいているみたいです

```yaml:エラー発生時のswagger.yamlの抜粋
      responses:
        '200':
          description: 日本語のコメント
          schema:
            type: object
            properties:
              metadata:
                $ref: '#/definitions/MetaData'
              result:
                type: object
                properties:
                  realestate_article:
                    type: array
                    items:
                      $ref: '#/definitions/RealestateArticle'
```

```yaml:修正後のswagger.yamlの抜粋
      responses:
        '200':
          description: in success
          schema:
            type: object
            properties:
              metadata:
                $ref: '#/definitions/MetaData'
              result:
                type: object
                properties:
                  realestate_article:
                    type: array
                    items:
                      $ref: '#/definitions/RealestateArticle'
```

```bash:エラー内容
com.amazonaws.services.apigateway.model.BadRequestException: Invalid model name specified: application/json=null (Service: null; Status Code: 400; Error Co
de: null; Request ID: sample-sample-samplesample)
        at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:1275)
        at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:873)
        at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:576)
        at com.amazonaws.http.AmazonHttpClient.doExecute(AmazonHttpClient.java:362)
        at com.amazonaws.http.AmazonHttpClient.executeWithTimer(AmazonHttpClient.java:328)
        at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:307)
        at com.amazonaws.hal.client.HalClient.invoke(HalClient.java:235)
        at com.amazonaws.hal.client.HalClient.putResource(HalClient.java:122)
        at com.amazonaws.hal.client.HalResourceInvocationHandler.invoke(HalResourceInvocationHandler.java:125)
        at com.sun.proxy.$Proxy33.putMethodResponse(Unknown Source)
        at com.amazonaws.service.apigateway.importer.impl.sdk.ApiGatewaySdkSwaggerApiImporter.lambda$createMethodResponses$11(ApiGatewaySdkSwaggerApiImport
er.java:515)
        at java.util.LinkedHashMap$LinkedEntrySet.forEach(LinkedHashMap.java:663)
        at com.amazonaws.service.apigateway.importer.impl.sdk.ApiGatewaySdkSwaggerApiImporter.createMethodResponses(ApiGatewaySdkSwaggerApiImporter.java:50
8)
        at com.amazonaws.service.apigateway.importer.impl.sdk.ApiGatewaySdkSwaggerApiImporter.createMethod(ApiGatewaySdkSwaggerApiImporter.java:237)
        at com.amazonaws.service.apigateway.importer.impl.sdk.ApiGatewaySdkSwaggerApiImporter.lambda$createMethods$3(ApiGatewaySdkSwaggerApiImporter.java:1
77)
        at java.util.HashMap$EntrySet.forEach(HashMap.java:1035)
        at com.amazonaws.service.apigateway.importer.impl.sdk.ApiGatewaySdkSwaggerApiImporter.createMethods(ApiGatewaySdkSwaggerApiImporter.java:176)
        at com.amazonaws.service.apigateway.importer.impl.sdk.ApiGatewaySdkSwaggerApiImporter.createResources(ApiGatewaySdkSwaggerApiImporter.java:168)
        at com.amazonaws.service.apigateway.importer.impl.sdk.ApiGatewaySdkSwaggerApiImporter.createApi(ApiGatewaySdkSwaggerApiImporter.java:69)
        at com.amazonaws.service.apigateway.importer.impl.ApiGatewaySwaggerFileImporter.importApi(ApiGatewaySwaggerFileImporter.java:48)
        at com.amazonaws.service.apigateway.importer.ApiImporterMain.importSwagger(ApiImporterMain.java:155)
        at com.amazonaws.service.apigateway.importer.ApiImporterMain.execute(ApiImporterMain.java:145)
        at com.amazonaws.service.apigateway.importer.ApiImporterMain.main(ApiImporterMain.java:83)
```