Bump snakeyaml from 1.19 to 1.28

Bumps snakeyaml from 1.19 to 1.28.

Commits

88c727c Implements RFC-0003 to restrict alias names
90f84bd Bump junit from 4.12 to 4.13.1
ec33956 implement serializer and emitter comment changes required changes to
d98d890 lint, comment, etc.
144d4cb Merge pull request #13 from asomov/dependabot/maven/junit-junit-4.13.1
e0b539c Merged in omer_comments_all (pull request #7)
3346ced Update headers
c77d259 Update changes
84f4c0f Fix issue 493: env value can contain special characters
a4ffe22 Fix typo
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springfox / springfox-grails-integration

Bump snakeyaml from 1.19 to 1.28 #83