install.bat: fix parens-in-username breaking OTP path expansion#1826

hanuele wants to merge 1 commit into

elixir-lang:mainelixir-lang/elixir-lang.github.com:mainfrom

hanuele:fix/install-bat-parens-in-usernamehanuele/elixir-lang.github.com:fix/install-bat-parens-in-usernameCopy head branch name to clipboard