Clint Combs

Replace call to newInstance in SwaggerPlugin with call to getDeclaredConstructor().newInstance() per: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Class.html#newInstance()

@potix2 please see: https://github.com/ClintCombs/spark-google-spreadsheets/pull/8 I need a new "case3" tab as shown in the above pull request. Will you add it? Thanks, Clint