Update install.txt

Author: pichillilorenzo

changelog/install.txt

@@ -43,9 +43,7 @@ jQuery and NativeScript completions disabled by default!
 You can enable them on Preferences -> Package Settings -> JavaScript Completions.
 
 Some features could use npm!
-
-In Windows you must install it! Download it from https://nodejs.org.
-To OSX and Linux, it will be downloaded automatically with nodejs.
+It will be downloaded automatically with nodejs.
 
 Features list:
 - "Find JavaScript Description" Feature