Release 1.4.0

This will be the last release in the v1 series. See below for notes on the
forthcoming v2 release.

Changes

• Numerous dependency updates
• Modernized tests using qunit-sinon-assertions
• Add deprecations for adapters extending EmberObject
• Deprecate an automatic identify event with Amplitude adapter (see #278)
• Type numerous object transformation tools (#343)
• Documentation updated
• Add the Pendo adapter

Upcoming v2 release

• An upgrade guide will be made available as soon as possible
• This should resolve the embroider-optimized scenario failures

Closing remarks

A hearty thank you to all contributors. The following people contributed to this release:

• @GreatWizard
• @jfdnc
• @Windvis