update

backend/requirements.txt

 appdirs==1.4.4
+certifi==2020.12.5
+chardet==4.0.0
 click==7.1.2
+cx-Freeze==6.6
+cx-Logging==3.0
 Flask==1.1.2
 Flask-Cors==3.0.10
 Flask-Login==0.5.0
 fs==2.4.12
+idna==2.10
+importlib-metadata==4.0.1
 itsdangerous==1.1.0
 Jinja2==2.11.3
 MarkupSafe==1.1.1
@@ -11,6 +17,9 @@ marshmallow==3.10.0
 pony==0.7.14
 PyJWT==2.0.1
 pytz==2021.1
+requests==2.25.1
 six==1.15.0
 tornado==6.1
+urllib3==1.26.4
 Werkzeug==1.0.1
+zipp==3.4.1