Update dependency graphene to v2.1.8

[renovate]

This PR contains the following updates:

Package	Update	Change
graphene	patch	==2.1.3 -> ==2.1.8

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Release Notes

graphql-python/graphene

v2.1.8

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Changelog

• Bump pinned aniso8601 version
• Allow mutations to apply the interfaces META argument to have the payload object type implement the desired interfaces

v2.1.7

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Update graphql-relay dependency to fix incompatibility.

v2.1.6

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Changelog

• Fix malformed version on aniso8601 requirement (#​995) 431e93c

Documentation

• Revise documentation (#​969) 5cb7d91
• Expose livehtml autobuild in Makefile + Add API autodoc (#​971) da1359e

Full changelog: graphql-python/graphene@v2.1.5...v2.1.6

v2.1.5

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Changelog

• Add Decimal type d728b84
• Allow Union types to have descriptions 8d4b9cd
• Add type documentation for Relay fields 131cbeb
• Mutation description now defaults to docstring 37a6c01
• Fix Windows support ae7a5d7
• The default resolver for ObjectTypes now handles dicts and objects ca9188a
• Date, DateTime and Time types now accept datetime.datetime, datetime.date, and datetime.time resp. inputs when used as variables 7b6dae7
• Make UUID type compatible with all string types in Python 2 7b6dae7
• Allow relay connection node to be wrapped in a NonNull type abff3d7
• from_enum can now take a deprecation reason 6a4091b
• Update aniso8601 dependency to allow versions 4+ a5162e9
• Drop support for Python 3.4 because it is EOL f73055f
• Allow type annotation in meta classes eb7966e

Documentation

Too many documentation improvements to list out here and lots more to come. Watch this space.

Full changelog: graphql-python/graphene@v2.1.3...v2.1.5

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Note: v2.1.4 was never released to PyPi due to build issues. We went straight from v2.1.3 to v2.1.5

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