Remove encoding header

Fixes #2996

ci/check_api_endpoint.py

@@ -2,9 +2,6 @@
 Test that the root API endpoint is available.
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import json
 import requests
 

ci/check_js_templates.py

@@ -7,9 +7,6 @@ This is because the "translated" javascript files are compiled into the "static"
 They should only contain template tags that render static information.
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import sys
 import re
 import os

ci/check_locale_files.py

@@ -1,8 +1,5 @@
 """ Check that there are no database migration files which have not been committed. """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import sys
 import subprocess
 

ci/check_migration_files.py

@@ -1,8 +1,5 @@
 """ Check that there are no database migration files which have not been committed. """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import sys
 import subprocess
 

ci/check_version_number.py

@@ -2,9 +2,6 @@
 On release, ensure that the release tag matches the InvenTree version number!
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import sys
 import re
 import os