Added tag corresponding to new preview API version 2018-05-01-preview

[kalyanaj]

Added tag corresponding to new preview API version 2018-05-01-preview.

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AutoRest linter results for ARM Related Validation Errors/Warnings

These errors are reported by the ARM team's validation tools, reachout to ARM RP API Review directly for any questions or concerns.

File: specification/eventgrid/resource-manager/readme.md

⚠️0 new Warnings.(1 total)

❌2 new Errors.(2 total)

Code	Id	Source	Message
PatchBodyParametersSchema	R2016	Link	Properties of a PATCH request body must not be default-valued. PATCH operation: 'EventSubscriptions_Update' Model Definition: 'EventSubscriptionUpdateParameters' Property: 'eventDeliverySchema'
TrackedResourcePatchOperation	R3026	Link	Tracked resource 'Topic' must have patch operation that at least supports the update of tags. It's strongly recommended that the PATCH operation supports update of all mutable properties as well.

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AutoRest linter results for SDK Related Validation Errors/Warnings

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File: specification/eventgrid/resource-manager/readme.md

⚠️0 new Warnings.(1 total)

❌0 new Errors.(0 total)

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[lmazuel]

LGTM