failed when tried to fetch python binary

[ariyuan]

pyenv install -v $PYTHON_VERSION

The above line failed with error:

Downloading Python-3.7.3.tar.xz... -> https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz error: failed to download Python-3.7.3.tar.gz

After I added the wget to the package list, it's OK