Update README.md

[deanrad]

This just updates the example to be consistent with the docs for Observable.of https://rxjs-dev.firebaseapp.com/api/index/function/of

Let's continue to chat @hannahhoward ! PS Here's a link to rx-helper: https://github.com/deanius/rx-helper

Goals

Implementation

For discussion

[coveralls]

Pull Request Test Coverage Report for Build 568

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 36:	0.0%
Covered Lines:	62
Relevant Lines:	62

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💛 - Coveralls