root/pypi: links for gbtgridder-20m

root/pypi gbtgridder_20m-1.5.1.tar.gz
root/pypi gbtgridder_20m-1.5.1-py3-none-any.whl
root/pypi gbtgridder_20m-1.5.tar.gz
root/pypi gbtgridder_20m-1.5-py3-none-any.whl