Modernize syntax, drop Python EOL, drop drop Django<1.11, upgrade TravisCI config to v1, add Python 3.8 & Django 3.x

django_mailbox/migrations/0001_initial.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 
 

django_mailbox/migrations/0002_add_eml_to_message.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 
 

django_mailbox/migrations/0003_auto_20150409_0316.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 
 

django_mailbox/migrations/0004_bytestring_to_unicode.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 
 

django_mailbox/migrations/0005_auto_20160523_2240.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 import django_mailbox.utils
 

django_mailbox/migrations/0006_mailbox_last_polling.py

@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
 # Generated by Django 1.9.8 on 2016-08-15 22:39
-from __future__ import unicode_literals
 
 from django.db import migrations, models
 

django_mailbox/migrations/0007_auto_20180421_0026.py

@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
 # Generated by Django 1.10.7 on 2018-04-21 00:26
-from __future__ import unicode_literals
 
 from django.db import migrations