Support marshmallow 4.0.0 & add e2e tests #1
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Hi! I saw your repo in the StackOverflow answer and wanted to use it, but discovered that it no longer works since the update of
marshmallowto version 4 (which introduced a bunch of breaking changes) since it uses fields that were removed in the update.This PR addresses all the necessary changes and also adds some simple e2e tests, as none of the existing tests failed when the
marshmallowdependency was upgraded in therequirements.txt.Let me know if anything needs to be changed.