Use deepSet when updating RUNNING_VALIDATIONS for nested key

[SergeAstapov]

When ember-changeset is used for complex objects with nested keys in combination with ember-cp-validations (via ember-changeset-cp-validations) changes to nested keys produce an error Property set failed: object in path "person" could not be found or was destroyed.

Reproduction can be found at https://9j9o487k3o.sse.codesandbox.io/ (open console and click on checkbox).

Changes proposed in this pull request

Use deepSet instead of set to support nested keys.

[SergeAstapov]

Build fails in beta with error

dummy/tests/integration/components/changeset-test.js: Assertion Failed: Cannot invoke the `changeset` helper because it was shadowed by a local variable (i.e. a block param) with the same name. Please rename the local variable to resolve the conflict. (L2:C14) 

That assertion was introduced in emberjs/ember.js#17132.

Fixed in #329

[SergeAstapov]

@snewcomer I see there is large work happens in #317 and #327 (which is awesome!).
Meanwhile can this be releases as patch version? Is there anything I can help to push this and #330 forward?

[snewcomer]

Yeah of course :). Will review by early next week. Need to figure out what to pull into 2.0 and what to fix directly!

[snewcomer]

Published 1.6.0! Thanks @SergeAstapov. Will add note however, that many users may want to stay on 1.3.0. It depends on their use cases.