Fix usage

[styfle]

You have two exports default and parseArgsStringToArgv.

The usage shown did not use the default name so it's probably best to use the named export.

[Cellule]

You're right, I'm too used to typescript development, I wrote the usage with the following in mind

import stringArgv from 'string-argv';
var args = stringArgv(
  '-testing test -valid=true --quotes "test quotes" "nested \'quotes\'" --key="some value" --title="Peter\'s Friends"',
  'node',
  'testing.js'
);

I should update it with a js and a ts version