fix(rxjs): bump rxjs to 6.6.7 && adding import 'rxjs/add/observable/of'

[shlomodaari]

https://stackoverflow.com/questions/36568388/observable-of-is-not-a-function

[spinnakerbot]

The following commits need their title changed:

• b6cf8dc: fix(rxjs) import 'rxjs/add/observable/of'

Please format your commit title into the form:

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[shlomodaari]

The error message indicates that your Yarn lockfile needs to be updated, but you ran the yarn command with the --frozen-lockfile flag.

The --frozen-lockfile flag is used to strictly enforce using the existing lockfile without making any changes or updates. If your lockfile needs to be updated due to changes in the package.json file or other dependencies, running yarn with --frozen-lockfile will result in an error.

[shlomodaari]

@mattgogerly