Update the ipython dependency version

Author: mdmintz

requirements.txt

@@ -62,7 +62,7 @@ prompt-toolkit==3.0.16;python_version>="3.6"
 ipython==5.10.0;python_version<"3.5"
 ipython==6.5.0;python_version>="3.5" and python_version<"3.6"
 ipython==7.16.1;python_version>="3.6" and python_version<"3.7"
-ipython==7.20.0;python_version>="3.7"
+ipython==7.21.0;python_version>="3.7"
 colorama==0.4.4
 pathlib2==2.3.5;python_version<"3.5"
 importlib-metadata==2.0.0;python_version<"3.6"

setup.py

@@ -166,7 +166,7 @@
         'ipython==5.10.0;python_version<"3.5"',
         'ipython==6.5.0;python_version>="3.5" and python_version<"3.6"',
         'ipython==7.16.1;python_version>="3.6" and python_version<"3.7"',
-        'ipython==7.20.0;python_version>="3.7"',
+        'ipython==7.21.0;python_version>="3.7"',
         'colorama==0.4.4',
         'pathlib2==2.3.5;python_version<"3.5"',  # Sync with "virtualenv"
         'importlib-metadata==2.0.0;python_version<"3.6"',  # Sync "virtualenv"