fix small compilation bug

Author: AaronWDS

src/main/java/com/docusign/httpsconnectwebhookhmacvalidation.java

@@ -1,3 +1,5 @@
+package com.docusign;
+
 import java.io.UnsupportedEncodingException;
 import java.nio.file.Files;
 import java.nio.file.Paths;