How to update from v10 to V11

[saurabh6790]

Master branch : v10
Staging branch : v11

If you want to switch to v11, goto your bench and run

1. Switch to staging branch
   bench switch-to-branch staging frappe
   bench switch-to-branch staging erpnext

2. Setup requirements
   bench setup requirements

3. Migrate site
   bench --site site-name migrate

4. Restart supervisor.
   bench restart