message: Fluvio install fix for windows
  Closes and
  Testing this is a little hard as we don't have any fluvio packages built for windows. However, the initial call to `fluvio` on windows creates a directory of `C:\Users\User\.fluvio\extensions` where `User` is the username of the user.
diff: @@ -178,7 +178,7 @@ fn make_executable(file: &mut File) -> Result<(), IoError> {
  #[cfg(not(unix))]
  fn make_executable(_file: &mut File) -> Result<(), IoError> {
  - unimplemented!();
  + Ok(())
  }
  pub fn install_println<S: AsRef<str>>(string: S) {
  