Cutovered duo_client_java fully to c5 (#91)

Author: Polyakiv-Andrey

duo-client/src/main/java/com/duosecurity/client/Admin.java

@@ -3,7 +3,6 @@
 public class Admin extends Http {
   private Admin(String inMethod, String inHost, String inUri, int timeout) {
     super(inMethod, inHost, inUri, timeout);
-    this.sigVersion = 5;
   }
 
   public static class AdminBuilder extends ClientBuilder<Admin> {

duo-client/src/main/java/com/duosecurity/client/Http.java

@@ -41,7 +41,7 @@ public class Http {
   private final String hashingAlgorithm = "SHA-512";
   private Headers.Builder headers;
   private SortedMap<String, Object> params = new TreeMap<String, Object>();
-  protected int sigVersion = 2;
+  protected int sigVersion = 5;
   private Random random = new Random();
   private OkHttpClient httpClient;
   private SortedMap<String, String> additionalDuoHeaders = new TreeMap<String, String>();