fix: add content to requirements.txt

requirements.txt

+asgiref==3.2.10
+astroid==2.4.2
+certifi==2020.6.20
+chardet==3.0.4
+colorama==0.4.3
+dj-database-url==0.5.0
+Django==3.1
+django-cleanup==5.0.0
+django-cors-headers==3.4.0
+djangorestframework==3.11.1
+djangorestframework-simplejwt==4.4.0
+gunicorn==20.0.4
+httpie==2.2.0
+idna==2.10
+isort==4.3.21
+lazy-object-proxy==1.4.3
+mccabe==0.6.1
+psycopg2-binary
+Pygments==2.6.1
+PyJWT==1.7.1
+pylint==2.5.3
+pylint-django==2.3.0
+pylint-plugin-utils==0.6
+pytz==2020.1
+requests==2.24.0
+rope==0.17.0
+six==1.15.0
+sqlparse==0.3.1
+toml==0.10.1
+urllib3==1.25.10
+whitenoise==5.2.0
+wrapt==1.12.1