[2020-07-02] Input Field @deprecated; talk to Shopify to determine SHOULD vs MUST

[benjie]

[ACTION - Evan] - talk to Shopify team and others to determine SHOULD vs MUST.

assignee(s): @eapache
source: https://github.com/graphql/graphql-wg/blob/master/notes/2020-07-02.md#moving-the-deprecated-directive-on-input-fields-rfc-to-stage-2-15m45m-stephen

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Note: Action Item issues are reviewed and closed during Working Group
meetings.

[benjie]

@eapache confirmed in #507 (comment) that this was completed; and I believe this was stated on the WG call yesterday, so closing this.

[benjie]

Additional details in this comment: graphql/graphql-spec#525 (comment)