fix test-unsio.sh

1 job for master in 2 minutes and 50 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #3187
manylinux2010

00:02:50

 
Name Stage Failure
failed
manylinux2010 Build
You should consider upgrading via the 'pip install --upgrade pip' command.
/opt/python/cp36-cp36m/bin/python: Error while finding module specification for 'unsio.test.ctestunsio' (ModuleNotFoundError: No module named 'unsio')
Testing with /opt/python/cp37-cp37m....
WARNING: Requirement 'wheelhouse/*unsio*cp37-cp37m-many*.whl' looks like a filename, but the file does not exist
ERROR: *unsio*cp37-cp37m-many*.whl is not a valid wheel filename.
WARNING: You are using pip version 19.1.1, however version 19.2.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
/opt/python/cp37-cp37m/bin/python: Error while finding module specification for 'unsio.test.ctestunsio' (ModuleNotFoundError: No module named 'unsio')
ERROR: Job failed: exit code 1