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Fix bash error in usage example on README page (#943)

* Fix bash error in usage example on README page

On Linux bash terminal, executing
`echo "console.log('Hello, world!')"`
gives the following error:
`bash: !': event not found`

To fix the issue, changing the log string from
`Hello, world!` to `Hello, world`

Tested on following systems:
* Ubuntu 18.04.3 LTS
* Linux Mint 19

* Switching the quotes to keep the exclamation mark

Switching the quotes around in the line
`echo "console.log('Hello, world!')" | ts-node`
to get the line as
`echo 'console.log("Hello, world!")' | ts-node`
in order to keep the exclamation mark, while also
avoiding the bash error at the same time.

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