andes failing with numpy versions containing 'rc'

[sanurielf]

Andes is falling when detecting NumPy versions because it may contain literals like "rc" at the end.

To Reproduce

pip install numpy==1.20.0rc2
pip install andes
andes prep

Expected behavior

The following output appears:

Saved generated pycode to "/Users/urielsandoval/.andes/pycode"
Loaded generated Python code in "/Users/urielsandoval/.andes/pycode".
Traceback (most recent call last):
File "/usr/local/bin/andes", line 33, in
sys.exit(load_entry_point('andes', 'console_scripts', 'andes')())
File "/Users/urielsandoval/Nextcloud/dev/andes/andes/cli.py", line 211, in main
return func(cli=True, **vars(args))
File "/Users/urielsandoval/Nextcloud/dev/andes/andes/main.py", line 728, in prepare
system.prepare(quick=quick, incremental=incremental, models=models,
File "/Users/urielsandoval/Nextcloud/dev/andes/andes/system.py", line 316, in prepare
self.dill()
File "/Users/urielsandoval/Nextcloud/dev/andes/andes/system.py", line 1351, in dill
np_ver = tuple([int(i) for i in np_ver])
File "/Users/urielsandoval/Nextcloud/dev/andes/andes/system.py", line 1351, in
np_ver = tuple([int(i) for i in np_ver])
ValueError: invalid literal for int() with base 10: '0rc2'