Backport "ExceptionGroup" to earlier Python versions

Author: mdmintz

requirements.txt

@@ -110,6 +110,7 @@ matplotlib-inline==0.1.6;python_version>="3.7"
 colorama==0.4.6;python_version<"3.6"
 colorama==0.4.5;python_version>="3.6" and python_version<"3.7"
 colorama==0.4.6;python_version>="3.7"
+exceptiongroup==1.0.0;python_version>="3.7" and python_version<"3.11"
 importlib-metadata==2.1.3;python_version<"3.6"
 importlib-metadata==4.2.0;python_version>="3.6" and python_version<"3.8"
 pycparser==2.21

setup.py

@@ -235,6 +235,7 @@
         'colorama==0.4.6;python_version<"3.6"',
         'colorama==0.4.5;python_version>="3.6" and python_version<"3.7"',
         'colorama==0.4.6;python_version>="3.7"',
+        'exceptiongroup==1.0.0;python_version>="3.7" and python_version<"3.11"',  # noqa: E501
         'importlib-metadata==2.1.3;python_version<"3.6"',
         'importlib-metadata==4.2.0;python_version>="3.6" and python_version<"3.8"',  # noqa: E501
         "pycparser==2.21",