Update voluptuous to 0.11.3

[pyup-bot]

This PR updates voluptuous from 0.10.5 to 0.11.3.

Changelog

0.11.0

**Changes**:

- [293](https://github.com/alecthomas/voluptuous/pull/293): Support Python 3.6.
- [294](https://github.com/alecthomas/voluptuous/pull/294): Drop support for Python 2.6, 3.1 and 3.2.
- [318](https://github.com/alecthomas/voluptuous/pull/318): Allow to use nested schema and allow any validator to be compiled.
- [324](https://github.com/alecthomas/voluptuous/pull/324):
Default values MUST now pass validation just as any regular value. This is a backward incompatible change if a schema uses default values that don't pass validation against the specified schema.
- [328](https://github.com/alecthomas/voluptuous/pull/328):
Modify `__lt__` in Marker class to allow comparison with non Marker objects, such as str and int.

**New**:

- [307](https://github.com/alecthomas/voluptuous/pull/307): Add description field to `Marker` instances.
- [311](https://github.com/alecthomas/voluptuous/pull/311): Add `Schema.infer` method for basic schema inference.
- [314](https://github.com/alecthomas/voluptuous/pull/314): Add `SomeOf` validator.

**Fixes**:

- [279](https://github.com/alecthomas/voluptuous/pull/279):
Treat Python 2 old-style classes like types when validating.
- [280](https://github.com/alecthomas/voluptuous/pull/280): Make
`IsDir()`, `IsFile()` and `PathExists()` consistent between different Python versions.
- [290](https://github.com/alecthomas/voluptuous/pull/290): Use absolute imports to avoid import conflicts.
- [291](https://github.com/alecthomas/voluptuous/pull/291): Fix `Coerce` validator to catch `decimal.InvalidOperation`.
- [298](https://github.com/alecthomas/voluptuous/pull/298): Make `Schema([])` usage consistent with `Schema({})`.
- [303](https://github.com/alecthomas/voluptuous/pull/303): Allow partial validation when using validate decorator.
- [316](https://github.com/alecthomas/voluptuous/pull/316): Make `Schema.__eq__` deterministic.
- [319](https://github.com/alecthomas/voluptuous/pull/319): Replace implementation of `Maybe(s)` with `Any(None, s)` to allow it to be compiled.

Links

• PyPI: https://pypi.org/project/voluptuous
• Changelog: https://pyup.io/changelogs/voluptuous/
• Repo: https://github.com/alecthomas/voluptuous

[pyup-bot]

Closing this in favor of #278