fix: forward service error message

Author: Eric Ptak

lib/Request.js

@@ -234,7 +234,12 @@ class Request {
       return error;
     }
 
-    error = new CoreError(error, { statusCode: error.status });
+    const message =
+      error.response && error.response.body && error.response.body.message
+        ? error.response.body.message
+        : error.message || error;
+
+    error = new CoreError(message, { statusCode: error.status });
     return error;
   }