[Security] Bump pyyaml from 3.13 to 5.1

Bumps pyyaml from 3.13 to 5.1. This update includes security fixes.

Vulnerabilities fixed

*Sourced from [The Sonatype OSS Index](https://ossindex.sonatype.org/vuln/8d14381a-93f1-46ac-9027-d8fea9b7874e).* > **[CVE-2017-18342] Improper Input Validation** > In PyYAML before 4.1, the yaml.load() API could execute arbitrary code. In other words, yaml.safe_load is not used. > > Affected versions: < 4.1.0

Changelog

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

Commits

- [`e471e86`](https://github.com/yaml/pyyaml/commit/e471e86bf6dabdad45a1438c20a4a5c033eb9034) Updates for 5.1 release - [`9141e90`](https://github.com/yaml/pyyaml/commit/9141e900d10d280173335b20207e87d4a15e62c6) Windows Appveyor build - [`d6cbff6`](https://github.com/yaml/pyyaml/commit/d6cbff662084dd94bde5421ece495482d1b14454) Skip certain unicode tests when maxunicode not > 0xffff - [`69103ba`](https://github.com/yaml/pyyaml/commit/69103ba255dd807ecb576654e84bd5efba3bad6e) Update .travis.yml to use libyaml 0.2.2 - [`91c9435`](https://github.com/yaml/pyyaml/commit/91c9435bb667dc318c845f5b3e8af36bb84c66eb) Squash/merge pull request [#105](https://github-redirect.dependabot.com/yaml/pyyaml/issues/105) from nnadeau/patch-1 - [`507a464`](https://github.com/yaml/pyyaml/commit/507a464ce62c933bf667b2296a96ad45f0147873) Make default_flow_style=False - [`07c88c6`](https://github.com/yaml/pyyaml/commit/07c88c6c1bee51439a00bc07827980fbb161a1ad) Allow to turn off sorting keys in Dumper - [`611ba39`](https://github.com/yaml/pyyaml/commit/611ba395079026fda2ea67c4ad23eb6351c5aa18) Include license file in the generated wheel package - [`857dff1`](https://github.com/yaml/pyyaml/commit/857dff153d2c9f238d3a68821262b7764aeb44ea) Apply FullLoader/UnsafeLoader changes to lib3 - [`0cedb2a`](https://github.com/yaml/pyyaml/commit/0cedb2a0697b2bc49e4f3841b8d4590b6b15657e) Deprecate/warn usage of yaml.load(input) - Additional commits viewable in [compare view](https://github.com/yaml/pyyaml/compare/3.13...5.1)

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refaim / wots

[Security] Bump pyyaml from 3.13 to 5.1 #67