Log Message:
py-numba: updated to 0.50.0

Version 0.50.0:

This is a more usual release in comparison to the others that have been made in \ 
the last six months. It comprises the result of a number of maintenance tasks \ 
along with some new features and a lot of bug fixes.

Highlights of core feature changes include:

The compilation chain is now based on LLVM 9.
The error handling and reporting system has been improved to reduce the size of \ 
error messages, and also improve quality and specificity.
The CUDA target has more stream constructors available and a new function for \ 
compiling to PTX without linking and loading the code to a device. Further, the \ 
macro-based system for describing CUDA threads and blocks has been replaced with \ 
standard typing and lowering implementations, for improved debugging and \ 
extensibility.