Update dependency PyYAML to v5 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change	References
PyYAML	major	==3.12 -> ==5.1	source

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Release Notes

yaml/pyyaml

### [`v5.1`](https://togithub.com/yaml/pyyaml/blob/master/CHANGES#​51-2019-03-13) [Compare Source](https://togithub.com/yaml/pyyaml/compare/3.13...5.1) - [#​35](https://togithub.com/yaml/pyyaml/pull/35) -- Some modernization of the test running - [#​42](https://togithub.com/yaml/pyyaml/pull/42) -- Install tox in a virtualenv - [#​45](https://togithub.com/yaml/pyyaml/pull/45) -- Allow colon in a plain scalar in a flow context - [#​48](https://togithub.com/yaml/pyyaml/pull/48) -- Fix typos - [#​55](https://togithub.com/yaml/pyyaml/pull/55) -- Improve RepresenterError creation - [#​59](https://togithub.com/yaml/pyyaml/pull/59) -- Resolves [#​57](https://togithub.com/yaml/pyyaml/issues/57), update readme issues link - [#​60](https://togithub.com/yaml/pyyaml/pull/60) -- Document and test Python 3.6 support - [#​61](https://togithub.com/yaml/pyyaml/pull/61) -- Use Travis CI built in pip cache support - [#​62](https://togithub.com/yaml/pyyaml/pull/62) -- Remove tox workaround for Travis CI - [#​63](https://togithub.com/yaml/pyyaml/pull/63) -- Adding support to Unicode characters over codepoint 0xffff - [#​65](https://togithub.com/yaml/pyyaml/pull/65) -- Support unicode literals over codepoint 0xffff - [#​75](https://togithub.com/yaml/pyyaml/pull/75) -- add 3.12 changelog - [#​76](https://togithub.com/yaml/pyyaml/pull/76) -- Fallback to Pure Python if Compilation fails - [#​84](https://togithub.com/yaml/pyyaml/pull/84) -- Drop unsupported Python 3.3 - [#​102](https://togithub.com/yaml/pyyaml/pull/102) -- Include license file in the generated wheel package - [#​105](https://togithub.com/yaml/pyyaml/pull/105) -- Removed Python 2.6 & 3.3 support - [#​111](https://togithub.com/yaml/pyyaml/pull/111) -- Remove commented out Psyco code - [#​129](https://togithub.com/yaml/pyyaml/pull/129) -- Remove call to `ord` in lib3 emitter code - [#​143](https://togithub.com/yaml/pyyaml/pull/143) -- Allow to turn off sorting keys in Dumper - [#​149](https://togithub.com/yaml/pyyaml/pull/149) -- Test on Python 3.7-dev - [#​158](https://togithub.com/yaml/pyyaml/pull/158) -- Support escaped slash in double quotes "\\/" - [#​181](https://togithub.com/yaml/pyyaml/pull/181) -- Import Hashable from collections.abc - [#​256](https://togithub.com/yaml/pyyaml/pull/256) -- Make default_flow_style=False - [#​257](https://togithub.com/yaml/pyyaml/pull/257) -- Deprecate yaml.load and add FullLoader and UnsafeLoader classes - [#​263](https://togithub.com/yaml/pyyaml/pull/263) -- Windows Appveyor build ### [`v3.13`](https://togithub.com/yaml/pyyaml/blob/master/CHANGES#​313-2018-07-05) [Compare Source](https://togithub.com/yaml/pyyaml/compare/3.12...3.13) - Resolved issues around PyYAML working in Python 3.7.

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