Update requirements.txt

Author: IoTree

IoTree_dir/home_user/dj_iot/requirements.txt

@@ -5,7 +5,7 @@ django-crispy-forms==1.7.2
 idna==2.7
 Pillow==5.2.0
 pytz==2018.5
-requests==2.19.1
+requests==2.20.0
 urllib3==1.24.2
 pbkdf2==1.3
 djangorestframework==3.9.4