Bump marshmallow from 2.16.3 to 2.19.4

[dependabot-preview[bot]]

Bumps marshmallow from 2.16.3 to 2.19.4.

Changelog

*Sourced from [marshmallow's changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst).* > 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) > =================== > > Deprecation/Removal: > > - A RemovedInMarshmallow3 warning is raised when using fields.FormattedString. Use fields.Method or fields.Function instead (1141). > > 2.18.1 (2019-02-15) > =================== > > Bug fixes: > > - A `ChangedInMarshmallow3Warning` is no longer raised when `strict=False` (1108). Thanks Aegdesil for reporting. > > 2.18.0 (2019-01-13) > =================== > > Features: > > - Add warnings for functions in `marshmallow.utils` that are removed in marshmallow 3. > > Bug fixes: > ... (truncated)

Commits

- [`b063a10`](https://github.com/marshmallow-code/marshmallow/commit/b063a103ae5222a5953cd7453a1eb0d161dc5b52) Bump version and update changelog - [`6e08be0`](https://github.com/marshmallow-code/marshmallow/commit/6e08be0681aa8f51e9153ea478ca94f42479c77b) Merge pull request [#1249](https://github-redirect.dependabot.com/marshmallow-code/marshmallow/issues/1249) from marshmallow-code/1147_datetime_microsecond_2.x - [`179d16a`](https://github.com/marshmallow-code/marshmallow/commit/179d16a83dd7c58e61764d111ae959be6784949b) Support microseconds in from_iso_datetime when use_dateutil=False - [`ae55b27`](https://github.com/marshmallow-code/marshmallow/commit/ae55b27a8fb9124d1486baf87286d501014f06b1) Bump version and update changelog - [`84d8943`](https://github.com/marshmallow-code/marshmallow/commit/84d89438f1a121fa4ad9874ebfd326ba8d0f807d) Speed up watch-docs command - [`531ae14`](https://github.com/marshmallow-code/marshmallow/commit/531ae1488e166b0ba2e4a66eb76180ef503850a5) Merge pull request [#1238](https://github-redirect.dependabot.com/marshmallow-code/marshmallow/issues/1238) from marshmallow-code/1212_exclude_dot_notation_opts - [`79c7bd2`](https://github.com/marshmallow-code/marshmallow/commit/79c7bd2b4ea048b923ff54a1eedf3e6bcd1e6e27) Fix fields with dot notation in Meta.exclude on multiple instantiations - [`ac9ff95`](https://github.com/marshmallow-code/marshmallow/commit/ac9ff95432f929fb0fa2394c29b94d1f804a1504) Bump version and update changelog - [`674e396`](https://github.com/marshmallow-code/marshmallow/commit/674e396943217d4798e6d2ed084b8358cb8e8664) Merge pull request [#1179](https://github-redirect.dependabot.com/marshmallow-code/marshmallow/issues/1179) from marshmallow-code/2.x-overflow - [`49115d1`](https://github.com/marshmallow-code/marshmallow/commit/49115d1a9241450f5d1dbbc26021ba9bd50df1fe) Update changelog and add [@​brycedrennan](https://github.com/brycedrennan) to AUTHORS - Additional commits viewable in [compare view](https://github.com/marshmallow-code/marshmallow/compare/2.16.3...2.19.4)

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[dependabot-preview[bot]]

Superseded by #365.