rev shelf_web_socket in prep for publishing

[devoncarew]

• rev shelf_web_socket in prep for publishing

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• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

Contribution guidelines:

• See our contributor guide for general expectations for PRs.
• Larger or significant changes should be discussed in an issue before creating a PR.
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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:shelf_web_socket	2.0.1	ready to publish	shelf_web_socket-v2.0.1
package:shelf	1.4.3-wip	WIP (no publish necessary)
package:shelf_packages_handler	3.0.3-wip	WIP (no publish necessary)
package:shelf_proxy	1.0.5-wip	WIP (no publish necessary)
package:shelf_router	1.1.5-wip	WIP (no publish necessary)
package:shelf_router_generator	1.1.1-wip	WIP (no publish necessary)
package:shelf_static	1.1.3	already published at pub.dev
package:shelf_test_handler	2.0.3-wip	WIP (no publish necessary)

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.