Bump ipython version to fix security vulnerability

Author: Anirudh Goel

requirements.txt

@@ -11,6 +11,7 @@ bs4==0.0.1
 certifi==2019.6.16
 cffi==1.12.3
 chardet==3.0.4
+charset-normalizer==2.0.11
 Click==7.0
 cryptography==3.3.2
 decorator==5.0.7
@@ -25,11 +26,11 @@ Flask-User==1.0.1.5
 Flask-WTF==0.14.2
 gunicorn==19.9.0
 idna==2.8
-ipython==7.16.1
+ipython==7.16.3
 ipython-genutils==0.2.0
 isort==5.8.0
 itsdangerous==1.1.0
-jedi==0.18.0
+jedi==0.17.0
 Jinja2==2.11.3
 lazy-object-proxy==1.6.0
 Mako==1.1.0