Update marshmallow to 3.8.0#187

alexppg merged 1 commit intomasterpython-microservices/microservices-scaffold:masterfrom

pyup-update-marshmallow-3.6.1-to-3.8.0python-microservices/microservices-scaffold:pyup-update-marshmallow-3.6.1-to-3.8.0Copy head branch name to clipboard