Fix pyhton 3 compatibility
diff --git a/erpnext/hub_node/api.py b/erpnext/hub_node/api.py
index 6e11a86..85693c7 100644
--- a/erpnext/hub_node/api.py
+++ b/erpnext/hub_node/api.py
@@ -3,12 +3,13 @@
from frappe.utils import now
from frappe.frappeclient import FrappeClient
from frappe.desk.form.load import get_attachments
+from six import string_types
@frappe.whitelist()
def call_hub_method(method, params=None):
connection = get_hub_connection()
- if type(params) == unicode:
+ if isinstance(params, string_types):
params = json.loads(params)
params.update({