Update admin.py to comply with Flake8

Author: KushPatel-18

server/friend/admin.py

@@ -3,6 +3,7 @@
 from friend.models import FriendRequest, FriendList
 # Register your models here.
 
+
 class FriendListAdmin(admin.ModelAdmin):
     list_filter = ['user']
     list_display = ['user']
@@ -12,8 +13,10 @@ class FriendListAdmin(admin.ModelAdmin):
     class Meta:
         model = FriendList
 
+
 admin.site.register(FriendList, FriendListAdmin)
 
+
 class FriendRequestAdmin(admin.ModelAdmin):
     list_filter = ['sender', 'receiver']
     list_display = ['sender', 'receiver']
@@ -22,4 +25,6 @@ class FriendRequestAdmin(admin.ModelAdmin):
 
     class Meta:
         model = FriendRequest
-admin.site.register(FriendRequest, FriendRequestAdmin)
+
+
+admin.site.register(FriendRequest, FriendRequestAdmin)