update spdx-tools version

[armintaenzertng]

update the requirements.txt to include the new spdx-tools release

Signed-off-by: Armin Tänzer [email protected]

[pombredanne]

Thanks for this, but the requirements.xt files is used as a pip constraints file, not as requirements and extractcode does not use the SPDX library.... this file comes directly from the skeleton https://github.com/nexB/skeleton ... Hence I am closing!