Stick marshmallow to 3 version#108

swember merged 2 commits intomainchartmogul/chartmogul-python:mainfrom

dmitriydavydov/sc-67157/restrict-marshmallow-dep-by-4-version-inchartmogul/chartmogul-python:dmitriydavydov/sc-67157/restrict-marshmallow-dep-by-4-version-inCopy head branch name to clipboard