Typo in Wiki Page
### Proposed Change

`If your running an older operating system you will not be able to update...` is incorrect. 
The word "your" is spelt incorrectly.

Correct is:
`If you are running an older operating system you will not be able to update...`
or alternatively:
`If you're running an older operating system you will not be able to update...`


### Wiki Page Link

https://github.com/homebridge/homebridge/wiki/How-To-Update-Node.js#does-my-operating-system-support-an-updated-nodejs