fix interface implementation

Author: stephen powis

src/main/java/com/darksci/pardot/api/rest/HttpClientRestClient.java

@@ -133,11 +133,15 @@ public void close() {
      * Make a request against the Pardot API.
      * @param request The request to submit.
      * @return The response, in UTF-8 String format.
-     * @throws IOException if something goes wrong?
+     * @throws RestException if something goes wrong.
      */
     @Override
-    public RestResponse submitRequest(final Request request) throws IOException {
-        return submitRequest(request, new RestResponseHandler());
+    public RestResponse submitRequest(final Request request) throws RestException {
+        try {
+            return submitRequest(request, new RestResponseHandler());
+        } catch (IOException exception) {
+            throw new RestException(exception.getMessage(), exception);
+        }
     }
 
     /**

src/main/java/com/darksci/pardot/api/rest/MockRestClient.java

@@ -19,7 +19,7 @@ public void init(final Configuration configuration) {
     }
 
     @Override
-    public RestResponse submitRequest(final Request request) throws IOException {
+    public RestResponse submitRequest(final Request request) throws RestException {
         // Not implemented yet.
         return null;
     }