updates readme

Author: tainguyenbui

README.md

@@ -57,7 +57,7 @@ http://demo.dataverse.org/api/datasets/389608/versions/1
 
 `public async getMetricByCountry(datasetId: string, metricType: DataverseMetricType, countryCode?: string, yearMonth?: string) {`
 
-`public async replaceFile(fileId: string, filename: string, fileBuffer: Buffer): Promise<any> {`
+`  public async replaceFile(fileId: string, filename: string, fileBuffer: Buffer, jsonData: object = {}): Promise<any> {`
 
 `public async publishDataset(datasetId: string, versionUpgradeType: DatasetVersionUpgradeType = DatasetVersionUpgradeType.MAJOR): Promise<AxiosResponse> {`