Full Changelog: 1.0.0a8...1.0.0a9

TL;DR

What's new?

Other standards of C++ (such as 98, 03, 11, 17, 20, and 23) have been added to this update (#28). That means multiple standards with newer libraries have been added while preserving legacy C++ kernel features for enterprise to test their code.
The execution time is faster than x3 times, thanks to @anhvlt-2k6, who helped remove unnecessary features of the C++ kernel and changed the concept of C++ pre-processing for faster execution time.
As the older standards are also supported, the kernel also offers the compatibility mode for older standards of C++ (such as 98 and 03) to support the nullptr, and include additional C/C++ headers (you can see what are included in here)
New defined math definitions have been added. You can see what is included in here

main() is not working properly with the extended main function (#38)
Kernel doesn't work with VS code. However, Visual Studio Code with Jupyter Notebook with C++ kernel only works on non-Windows environments. (Issue: #41, discussion about the limitation is here)

You have to install GNU Compiler Collection for Windows before doing any additional installation

You have to install GNU Compiler Collection that is compatible with your OS. You may need to go search for yourself.

python -m pip install --upgrade jupyter-cpp-kernel

sudo pip install --upgrade jupyter-cpp-kernel
# Or
pip install --upgrade jupyter-cpp-kernel