Update marshmallow to 3.9.0#229

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

pyup-update-marshmallow-3.8.0-to-3.9.0python-microservices/microservices-scaffold:pyup-update-marshmallow-3.8.0-to-3.9.0Copy head branch name to clipboard