Update hooks-README.md

I think letting know to users of Windows that a shebang line is expected at the start of their non bat scripts is a good idea, since its not typical for Windows users to write shebangs. I found out myself not knowing how to make my python and node.js scripts to work as hooks until I read cordova-lib\src\cordova\hooker.js line 77, function extractSheBangInterpreter.
Thanks for adding to the README, this sis a good point to mention here. Some minor comments:
 1. This needs rephrasing: "... which is recomended for use the code in a non-windows operating system ..."
 2. recomMended (missing m)
 3. Redundant repeat that doesn't sound good "in case your hook script aren't bat files" .... "if the script is not a bat file"