Update mode_of_payment.py

Renamed solves issue #1536
diff --git a/erpnext/accounts/doctype/mode_of_payment/mode_of_payment.py b/erpnext/accounts/doctype/mode_of_payment/mode_of_payment.py
index ddabf89..f07c42b 100644
--- a/erpnext/accounts/doctype/mode_of_payment/mode_of_payment.py
+++ b/erpnext/accounts/doctype/mode_of_payment/mode_of_payment.py
@@ -6,5 +6,5 @@
 
 from frappe.model.document import Document
 
-class ModeOfPayment(Document):
-	pass
\ No newline at end of file
+class ModeofPayment(Document):
+	pass