fix: replace extendObject utility w/ object spread

[jelbourn]

BREAKING CHANGE: The extendObject utility function is removed.

[crisbeto]

LGTM, you should be able to add Object.assign to the ban tslint rule as well.

[jelbourn]

Added to lint

[lucasvanhalst]

@jelbourn FYI you could use the prefer-object-spread rule instead of ban

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