Fix linting errors.

SatNOGS/base/models.py

@@ -27,6 +27,7 @@ class Transponder(models.Model):
     invert = models.BooleanField()
     baud = models.FloatField(validators=[MinValueValidator(0)])
 
+
 class Antenna(models.Model):
     """Model for antennas tracked with SatNOGS."""
     frequency = models.FloatField(validators=[MinValueValidator(0)])

SatNOGS/base/templatetags/tags.py

@@ -4,6 +4,7 @@ from django import template
 
 register = template.Library()
 
+
 @register.simple_tag
 def active(request, pattern):
     if re.search(pattern, request.path):

SatNOGS/users/models.py

@@ -2,7 +2,6 @@
 from django.contrib.auth.models import AbstractUser
 from django.core.validators import MaxLengthValidator
 from django.db import models
-from django.utils.translation import ugettext_lazy as _
 
 
 class User(AbstractUser):