Correct the example in README to use string instead of list
The URL should always be native.
Not only was this a waste of time, the logic was actually bad so it reintroduced a bug. Which sucks.
This should resolve requests-oauthlib's problems with uploading binary data, as demonstrated in kennethreitz/requests#1252.
StringIO compatible python 2 and 3
Follow-up from #19, pointed out by mart-e.
add quotes over url string