Update README.md

Fixed PowerShell formatting

README.md

@@ -31,7 +31,7 @@ Now, you can easily invoke a PuTTY session directly from PowerShell, without hav
 
 The `Invoke-PSPuTTYSession` provides Intellisense / auto-completion for your PuTTY saved sessions, making it significantly easier for you to connect to the session you want to!
 
-```
+```PowerShell
 Invoke-PSPuTTYSession -Name 'AWS Ubuntu'
 ```
 
@@ -80,4 +80,4 @@ These following commands currently **DO NOT** work, until they're implemented:
 This PowerShell module wouldn't be possible without the contributors listed below.
 
 - [Trevor Sullivan](https://trevorsullivan.net) (Colorado, United States of America)
-- [Joshua King](http://king.geek.nz/) (New Zealand)
+- [Joshua King](http://king.geek.nz/) (New Zealand)