chore: Update header: license.txt => LICENSE

The license.txt file has been replaced with LICENSE for quite a while
now. INAL but it didn't seem accurate to say "hey, checkout license.txt
although there's no such file". Apart from this, there were
inconsistencies in the headers altogether...this change brings
consistency.

payments/payment_gateways/doctype/braintree_settings/braintree_settings.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2018, Frappe Technologies and contributors
-# For license information, please see license.txt
+# License: MIT. See LICENSE
 
 import frappe
 from frappe.model.document import Document

payments/payment_gateways/doctype/braintree_settings/test_braintree_settings.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2018, Frappe Technologies and Contributors
-# See license.txt
+# License: MIT. See LICENSE
 import unittest
 
 class TestBraintreeSettings(unittest.TestCase):

payments/payment_gateways/doctype/paypal_settings/paypal_settings.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2015, Frappe Technologies and contributors
-# For license information, please see license.txt
+# License: MIT. See LICENSE
 
 """
 # Integrating PayPal

payments/payment_gateways/doctype/paytm_settings/paytm_settings.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2020, Frappe Technologies and contributors
-# For license information, please see license.txt
+# License: MIT. See LICENSE
 
 import json
 import requests

payments/payment_gateways/doctype/paytm_settings/test_paytm_settings.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2020, Frappe Technologies and Contributors
-# See license.txt
+# License: MIT. See LICENSE
 # import frappe
 import unittest
 

payments/payment_gateways/doctype/razorpay_settings/razorpay_settings.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2015, Frappe Technologies and contributors
-# For license information, please see license.txt
+# License: MIT. See LICENSE
 
 """
 # Integrating RazorPay

payments/payment_gateways/doctype/stripe_settings/stripe_settings.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2017, Frappe Technologies and contributors
-# For license information, please see license.txt
+# License: MIT. See LICENSE
 
 import frappe
 from frappe.model.document import Document

payments/payment_gateways/doctype/stripe_settings/test_stripe_settings.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2018, Frappe Technologies and Contributors
-# See license.txt
+# License: MIT. See LICENSE
 import unittest
 
 class TestStripeSettings(unittest.TestCase):

payments/payments/doctype/payment_gateway/payment_gateway.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and contributors
-# For license information, please see license.txt
+# License: MIT. See LICENSE
 
 import frappe
 from frappe.model.document import Document

payments/payments/doctype/payment_gateway/test_payment_gateway.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
-# See license.txt
+# License: MIT. See LICENSE
 import frappe
 import unittest
 

payments/templates/pages/payment_cancel.py

@@ -1,5 +1,5 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
-# See license.txt
+# License: MIT. See LICENSE
 
 import frappe
 

payments/templates/pages/payment_success.py

@@ -1,5 +1,5 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
-# See license.txt
+# License: MIT. See LICENSE
 
 import frappe
 no_cache = True