Bump webargs from 4.1.1 to 4.1.2 (#994)
Bump webargs from 4.1.1 to 4.1.2 (#994)

Bumps [webargs](https://github.com/sloria/webargs) from 4.1.1 to 4.1.2.
<details>
<summary>Changelog</summary>

*Sourced from [webargs's changelog](https://github.com/sloria/webargs/blob/dev/CHANGELOG.rst).*

> 4.1.2 (2018-11-03)
> ******************
> 
> Bug fixes:
> 
> * Fix serialization behavior of ``DelimitedList`` (:pr:`319`).
>   Thanks :user:`lee3164` for the PR.
> 
> Other changes:
> 
> * Test against Python 3.7.
</details>
<details>
<summary>Commits</summary>

- [`a0e4fb2`](https://github.com/sloria/webargs/commit/a0e4fb222581e3223e4b9385f82df288b286f9d1) Bump version and update changelog
- [`fd56de3`](https://github.com/sloria/webargs/commit/fd56de3c86c2e0594bfa698fbbff09a2a6f902ca) Increase min versins of frameworks
- [`0da0b6d`](https://github.com/sloria/webargs/commit/0da0b6d64845b42d0ccc37d9729648dc040bdc57) Update changelog
- [`7eb000a`](https://github.com/sloria/webargs/commit/7eb000a5ff8bef1fb18b8973f6bb8ad5b0607ce8) Merge pull request [#320](https://github-redirect.dependabot.com/sloria/webargs/issues/320) from sloria/tox
- [`8d24186`](https://github.com/sloria/webargs/commit/8d241867c13c98ce8d9060e2606eca806fba85c6) Merge pull request [#319](https://github-redirect.dependabot.com/sloria/webargs/issues/319) from lee3164/dev
- [`ba7e521`](https://github.com/sloria/webargs/commit/ba7e521afc60e6f33797044a7c070b1822d9f869) format code
- [`4e539aa`](https://github.com/sloria/webargs/commit/4e539aa0ec40dd652ad657a284f3746085d0c7f2) Update changelog and add python 3.7 classifier
- [`202b277`](https://github.com/sloria/webargs/commit/202b277f6e9fb22c0a7a7525a86dc5148004bbf2) Use tox for testing and task running
- [`c5919cb`](https://github.com/sloria/webargs/commit/c5919cbda2a987099d8bb9e0d7e2155e01aa5f73) delete commit info comment
- [`95add5c`](https://github.com/sloria/webargs/commit/95add5c47097b88e261bf45ae23c307fe04b8f9e) modify authors.rst
- Additional commits viewable in [compare view](https://github.com/sloria/webargs/compare/4.1.1...4.1.2)
</details>
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