Fix deposit client error:
> I've created a metadata file and I've tried to use this command to
> upload my submission:
>
> swh deposit upload --username ipol --password "mypassword" \
> --archive mlheIPOL.tgz \
> --collection 'ipol' \
> --metadata metadata_test1.xml
>
> However I get the following error:
>
> Traceback (most recent call last):
> File "/home/user/ipol/testSHsubmission/python3env/bin/swh",
> line 5, in <module>
> from swh.core.cli import main
> File
> "/home/user/ipol/testSHsubmission/python3env/lib/python3.5/site-
> packages/swh/core/cli/__init__.py", line 14, in <module>
> from ..sentry import init_sentry
> File
> "/home/user/ipol/testSHsubmission/python3env/lib/python3.5/site-
> packages/swh/core/sentry.py", line 14
> return f'{main_package}@{version}'
> ^
> SyntaxError: invalid syntax