Updated SteamCommunity (markdown)

SteamCommunity.md

@@ -21,6 +21,13 @@ Contains our SteamID (as a `SteamID` object) if we're logged in.
 
 # Methods
 
+### Constructor([localAddress])
+- `localAddress` - Optional. The IP address (in `x.x.x.x` format) that will be used for HTTP requests.
+
+**v3.5.0 or later is required to use the `localAddress` argument.**
+
+Constructs a new instance of SteamCommunity.
+
 ### login(details, callback)
 - `details` - An object containing our login details (see below)
 - `callback` - A function which will be called once we're logged in