chore(master): release 3.1.0

[release-please[bot]]

:robot: I have created a release beep boop

3.1.0 (2022-03-31)

Features

• Disable Express eTag response header for consistent FF behaviour across FF runtimes (#439) (07668f6)

Bug Fixes

• deps: update dependency minimist to v1.2.6 [security] (#432) (32bb723)

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[release-please[bot]]

:robot: Release is at https://github.com/GoogleCloudPlatform/functions-framework-nodejs/releases/tag/v3.1.0 :sunflower: