Bump marshmallow from 2.16.3 to 2.20.0

[dependabot-preview[bot]]

Bumps marshmallow from 2.16.3 to 2.20.0.

Changelog

*Sourced from [marshmallow's changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst).* > 2.20.0 (2019-08-10) > =================== > > Bug fixes: > > - Fix deprecated functions' compatibility with Python 2 (1337). Thanks airstandley for the catch and patch. > - Fix error message consistency for invalid input types on nested fields (1303). This is a backport of the fix in 857. Thanks cristi23 for the thorough bug report and the PR. > > Deprecation/Removal: > > - Python 2.6 is no longer officially supported (1274). > > 2.19.5 (2019-06-18) > ------------------- > > Bug fixes: > > - Fix deserializing ISO8601-formatted datetimes with less than 6-digit miroseconds (1251). Thanks diego-plan9 for reporting. > > 2.19.4 (2019-06-16) > ------------------- > > Bug fixes: > > - Microseconds no longer gets lost when deserializing datetimes without dateutil installed (1147). > > 2.19.3 (2019-06-15) > ------------------- > > Bug fixes: > > - Fix bug where nested fields in `Meta.exclude` would not work on multiple instantiations (1212). Thanks MHannila for reporting. > > 2.19.2 (2019-03-30) > ------------------- > > Bug fixes: > > - Handle `OverflowError` when (de)serializing large integers with `fields.Float` (1177). Thanks brycedrennan for the PR. > > 2.19.1 (2019-03-16) > ------------------- > > Bug fixes: > > - Fix bug where `Nested(many=True)` would skip first element when serializing a generator (1163). Thanks khvn26 for the catch and patch. > > 2.19.0 (2019-03-07) > ------------------- > > ... (truncated)

Commits

- [`2be2d83`](https://github.com/marshmallow-code/marshmallow/commit/2be2d83a1a9a6d3d9b85804f3ab545cecc409bb0) Bump version and update changelog - [`5d5c9b8`](https://github.com/marshmallow-code/marshmallow/commit/5d5c9b87c98fc7053c20fd5b179c3c5376d0d09a) Update changelog - [`5c958e7`](https://github.com/marshmallow-code/marshmallow/commit/5c958e762f2a274746bc4ae609d1a45c660e697f) Merge pull request [#1323](https://github-redirect.dependabot.com/marshmallow-code/marshmallow/issues/1323) from cristi23/type-error-fix - [`7be032a`](https://github.com/marshmallow-code/marshmallow/commit/7be032a66eb84bec79cbebac4a6cf789cd02d45b) Fix nitpicks - [`31748ad`](https://github.com/marshmallow-code/marshmallow/commit/31748adca0ac1828e7d7e5980ed81f600a4cd5ec) Update changelog - [`3d81c00`](https://github.com/marshmallow-code/marshmallow/commit/3d81c0023e41b75383dbed262574624b0d6f83e1) Merge pull request [#1338](https://github-redirect.dependabot.com/marshmallow-code/marshmallow/issues/1338) from airstandley/2.x-line - [`cc33d28`](https://github.com/marshmallow-code/marshmallow/commit/cc33d285a7aa0aa9acc44799fc5ba470f336566d) Add a regression test for deprecation warnings - [`c301680`](https://github.com/marshmallow-code/marshmallow/commit/c301680a3470e7cc88eceda1f2ca40e6e15f1a9c) Added absolute imports to make warnings Python 2.7 compatbile - [`514f5b0`](https://github.com/marshmallow-code/marshmallow/commit/514f5b080f664ac92fb950fdee1496e467592364) added some small unit tests to check that invalid data types are checked corr... - [`dd72a79`](https://github.com/marshmallow-code/marshmallow/commit/dd72a797ceeea63ee04d5e1838c3a5a1432347e3) Add benchmark script - Additional commits viewable in [compare view](https://github.com/marshmallow-code/marshmallow/compare/2.16.3...2.20.0)

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[dependabot-preview[bot]]

Superseded by #375.