Update dependency graphql-subscriptions to v1.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
graphql-subscriptions	dependencies	minor	1.0.0 -> 1.1.0

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Release Notes

apollostack/graphql-subscriptions

v1.1.0

Compare Source

• Fix #​132 - withFilter was previously always passing undefined as its first argument to the filterFn
• Partially attempt to fix #​143 - try to reduce occurrence of certain memory leaks with the built-in PubSubEngine implementation
• Replaced eventEmitterAsyncIterator with default generic AsyncIterator named PubSubAsyncIterator. extends PubSubEngine automatically uses generic implementation. No breaking changes for those who continue to use implements PubSubEngine. See PR #​78.

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