fix output in Object.assign() example
fix output in Object.assign() example

Something looked off about this so I did a quick check in node.
You must have been distracted at the time of writing :)
andersontr15/clean-code-javascript-es,chux0519/clean-code-javascript,HemantPawar/clean-code-javascript,greg-dev/clean-code-javascript-pl,DavidVujic/clean-code-javascript,ryanmcdermott/clean-code-javascript