Include `version.txt` in package build
Fixes the following error when importing the package:
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/lib/python3.9/site-packages/pyQuARC-1.1.0-py3.9.egg/pyQuARC/version.txt'
Fixes the following error when importing the package:
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/lib/python3.9/site-packages/pyQuARC-1.1.0-py3.9.egg/pyQuARC/version.txt'