Bump marshmallow from 4.1.0 to 4.2.1#1372

dependabot[bot] wants to merge 1 commit intomastergpchelkin/scdlbot:masterfrom

dependabot/pip/marshmallow-4.2.1gpchelkin/scdlbot:dependabot/pip/marshmallow-4.2.1Copy head branch name to clipboard