Update Template model to use BigAutoField for ID and remove obsolete migration (jazzband#157)

Author: vied12

dbtemplates/migrations/0003_alter_template_id.py

@@ -18,8 +18,8 @@ class Template(models.Model):
     Defines a template model for use with the database template loader.
     The field ``name`` is the equivalent to the filename of a static template.
     """
-    id = models.AutoField(primary_key=True, verbose_name=_('ID'),
-                          serialize=False, auto_created=True)
+    id = models.BigAutoField(primary_key=True, verbose_name=_('ID'),
+                             serialize=False, auto_created=True)
     name = models.CharField(_('name'), max_length=100,
                             help_text=_("Example: 'flatpages/default.html'"))
     content = models.TextField(_('content'), blank=True)